Bacteriological analysis of feces. What is a bacteriological study of feces? Staphylococcus saprophytic and epidermal

Materials subject to bacteriological examination are collected in sterile dishes, accompanied by a label with the name of the subject and the name of the material. In the accompanying document (direction), it is necessary to indicate which department sends the material, full name. and age of the patient, proposed diagnosis, antibiotic therapy, date and hour of sampling.

The material is delivered in containers, excluding their overturning. During transportation, wetting of cotton plugs and freezing of the material are not allowed. The material is delivered within 1-2 hours after taking. If it is impossible to deliver within the specified time, the biomaterial is stored in a refrigerator (except for blood and material examined for the presence of meningococcus). If the sample delivery time is increased to 48 hours, transport media must be used.

Sampling techniques should be described by the microbiologist in a specific instruction. Laboratory staff conducts initial training for all staff on compliance with sampling.

Samples delivered to the laboratory should be placed in a place specially designated for receiving biomaterial. Upon receipt, laboratory workers are responsible for monitoring compliance with the correct delivery of samples. Delivery of the material to the laboratory by the examined persons is strictly prohibited.

In case of non-compliance with the conditions, the samples are not subject to processing - this is reported to the attending physician, and the studies are repeated.

General requirements for sampling and transportation of samples:

Knowledge of the optimal timing for taking material for research;

Taking material, taking into account the place of maximum localization of the pathogen by releasing it into the environment;

Selection of material for research in the necessary and sufficient volume with the provision of conditions that exclude contamination of samples;

If possible, taking the material before the use of antibiotics and other chemotherapeutic drugs or after the abolition of antibiotics after 2-3 days.

Microbiological examination of blood

The procedural sister or laboratory assistant takes blood from the patient in the treatment room or in the ward, depending on the patient's condition. It is recommended to take blood for culture before the start of antibiotic therapy or 12-24 hours after the last administration of the drug to the patient.

Sowing is carried out during the rise in temperature. It is recommended to take blood 2-4 times a day, in case of acute sepsis - 2-3 samples from different places within 10 minutes. If the patient has a permanent subclavian catheter or system in a vein, they can be used to obtain blood only for 3 days, since catheter contamination occurs. A small amount of blood is allowed to drain freely into the test tube, then blood is drawn into the syringe for culture. Blood cultures are performed over an alcohol lamp.

Blood is taken from adults in the amount of 5-20 ml, and from children - 1-15 ml, from a syringe without a needle over an alcohol lamp, it is inoculated into vials with a nutrient medium in the ratio of blood and medium 1:10. The blood vials are delivered to the laboratory immediately.

Microbiological examination of urine

Examine, as a rule, the morning portion of urine. Before taking, a toilet of the external genital organs is carried out. When urinating, the first portion of urine is not used. In the second urination, starting from its middle, urine is collected in a sterile container in the amount of 3-10 ml, tightly closed with a sterile stopper. It is advisable to deliver urine samples to the laboratory immediately. In the absence of such an opportunity, urine can be stored at room temperature for 1-2 hours, but not more than 24 hours (at a temperature of 4 ° C) after taking.

Microbiological examination of feces

In infectious diseases (typhoid, paratyphoid, acute intestinal infections, dysentery) and nosocomial infections of the gastrointestinal tract, the material is taken from the first hours and days of the patient's admission to the start of antibiotic therapy. Samples are taken at least 2 times.

Feces for sowing are taken immediately after defecation. The collection is carried out from a vessel, a pot, a diaper, which are thoroughly disinfected beforehand and washed many times with hot water. From the dishes, feces are taken with a sterile spatula or stick into sterile jars with a lid, test tubes. The samples taken include pathological impurities (pus, mucus, flakes). If it is impossible to obtain bowel movements, the material is taken directly from the rectum using rectal swabs. The swab is moistened in saline and injected 8-10 cm, and then placed in sterile test tubes. Feces are delivered to the laboratory no later than 1-2 hours after collection. The material can be stored at a temperature of 2-6 °C for 24 hours.

Microbiological examination of cerebrospinal fluid

It is desirable to take cerebrospinal fluid before the start of antibiotic therapy - in a sterile tube with a lid in the amount of 1-3 ml. The material is delivered to the laboratory, where immediately, while the cerebrospinal fluid is warm, it is analyzed. If this is not possible, liquor can be stored at a temperature of 37 ° C in a thermostat for 2-3 hours.

During transportation, the liquor is carefully protected from cooling using heating pads, a thermos.

Microbiological examination of pus, biopsy of abscess walls

The test material in the maximum amount is taken with a sterile syringe and in it, with a closed needle, is delivered to the laboratory immediately or can be stored in the refrigerator for 2 hours.

Microbiological examination of sputum

The patient brushes his teeth before coughing, rinses his mouth and throat with boiled water. Sputum is collected in a sterile jar or vial with a lid; if it is poorly separated, it is recommended to prescribe expectorants the day before or the patient is allowed to inhale 25 ml of a 3-10% saline solution through a nebulizer.

Sputum can be stored for 2 hours at room temperature and for 24 hours in the refrigerator. When collecting sputum, the patient should not mix mucus and saliva in the mouth. Sputum, consisting of saliva and food particles, is not examined.

Microbiological examination of nasopharyngeal mucus, purulent discharge of the tonsils, discharged from the nose

The material is taken on an empty stomach or not earlier than 2-4 hours after a meal. The root of the tongue is pressed down with a spatula. The material is taken with a sterile swab, without touching the tongue, cheek mucosa and teeth.

When examining nasopharyngeal mucus for meningococcus, a curved sterile cotton swab is used. It is inserted end-up behind the soft palate into the nasopharynx and carried out 3 times along the back wall. In patients with tonsillitis, if diphtheria is suspected, the material is taken from the tonsils with a dry swab, in the presence of raids, it should be taken from the border of healthy and affected tissues, lightly pressing them with a swab. The material on dry swabs is delivered to the laboratory within 2 hours in bags with heating pads.

In whooping cough and parawhooping cough, nasopharyngeal mucus, nasopharyngeal lavage, transtrachelic aspirates are examined. While fixing the patient's head, a swab is inserted into the nostril up to the choanae and left there for 15-30 seconds, then removed and placed in a sterile tube. When collecting material from the mouth, the swab is inserted behind the soft palate, trying not to touch the tongue and tonsils. Remove the mucus from the back of the pharynx, carefully remove the swab, which is placed in a sterile test tube.

Analysis of feces for dysbacteriosis- this study allows you to determine the content of bacteria in the intestine. The human intestine contains a huge number of bacteria that are actively involved in the digestion and absorption of nutrients. Fecal analysis for dysbacteriosis is prescribed for the most part to children, in such cases when there are the following intestinal disorders: diarrhea, constipation, abdominal pain, flatulence, and also after long-term antibiotic treatment (antibiotics, in addition to fighting infections, also destroy normal gut bacteria). There are three groups of intestinal bacteria - “normal” bacteria (bifidobacteria, lactobacilli and escherichia), they are actively involved in the work of the intestine, opportunistic bacteria (enterococci, staphylococci, clostridia, candida) under certain circumstances can turn into pathogenic bacteria and cause various diseases, and pathogenic bacteria (Shigella, Salmonella) which, if they enter the intestines, cause serious infectious diseases of the intestines.

Norms of analysis of feces for dysbacteriosis

	Children under 1 year old	older children	adults
bifidobacteria	10 10 – 10 11	10 9 – 10 10	10 8 – 10 10
lactobacilli	10 6 – 10 7	10 7 – 10 8	10 6 – 10 8
Escherichia	10 6 – 10 7	10 7 – 10 8	10 6 – 10 8
Bacteroids	10 7 – 10 8	10 7 – 10 8	10 7 – 10 8
Peptostreptococci	10 3 – 10 5	10 5 – 10 6	10 5 – 10 6
Enterococci	10 5 – 10 7	10 5 – 10 8	10 5 – 10 8
Saprophytic staphylococci	≤10 4	≤10 4	≤10 4
Pathogenic staphylococci	-	-	-
Clostridia	≤10 3	≤10 5	≤10 5
candida	≤10 3	≤10 4	≤10 4
Pathogenic enterobacteria	-	-	-

bifidobacteria

Norm of bifidobacteria

About 95% of all bacteria in the gut are bifidobacteria. Bifidobacteria are involved in the production of such vitamins as B 1, B 2, B 3, B 5, B 6, B 12, K. They help the absorption of vitamin D, with the help of special substances produced by them, they fight "bad" batteries, and also participate in strengthening the immune system.

Reasons for the decrease in the number of bifidobacteria

Fermentopathies (celiac disease, lactase deficiency)
Immune diseases (immune deficiencies, allergies)
Change of climatic zones
Stress

lactobacilli

The norm of lactobacilli

Lactobacilli occupy about 4-6% of the total mass of intestinal bacteria. Lactobacilli are no less useful than bifidobacteria. Their role in the body is as follows: maintaining the pH level in the intestines, producing a large number of substances (lactic acid, acetic acid, hydrogen peroxide, lactocidin, acidophilus), which are actively used to destroy pathogenic microorganisms, and also produce lactase.

Reasons for the decrease in the number of lactobacilli

Drug treatment (antibiotics, non-steroidal anti-inflammatory drugs (NSAIDs) such as analgin, aspirin, laxatives)
Improper nutrition (excess fat or protein or carbohydrates, starvation, improper diet, artificial feeding)
Intestinal infections (dysentery, salmonellosis, viral infections)
Chronic diseases of the gastrointestinal tract (chronic gastritis, pancreatitis, cholecystitis, peptic ulcer of the stomach or duodenum)
Stress

Escherichia(E. coli typical)

Escherichia norm

Escherichia appear in the human body from birth and are present in it throughout life. They perform the following role in the body: they participate in the formation of B vitamins and vitamin K, participate in the processing of sugars, produce antibiotic-like substances (colicins) that fight pathogenic organisms, strengthen immunity.

Reasons for the decline in the number of Escherichia

Helminthiases
Antibiotic treatment
Improper nutrition (excess fat or protein or carbohydrates, starvation, improper diet, artificial feeding)
Intestinal infections (dysentery, salmonellosis, viral infections)

Bacteroids

The norm of bacteroids in feces

Bacteroids are involved in digestion, namely in the processing of fats in the body. In children under 6 months of age, stool tests are not detected, they can be detected starting from the age of 8-9 months.

Causes of an increase in the content of bacteroids

Fat diet (eating a lot of fat in food)

Reasons for the decrease in the content of bacteroids

Antibiotic treatment
Intestinal infections (dysentery, salmonellosis, viral infections)

Peptostreptococci

Normal amount in feces

Normally, peptostreptococci live in the large intestine, with an increase in their number and getting into any other area of our body, they cause inflammatory diseases. Participate in the processing of carbohydrates and milk proteins. They produce hydrogen, which is converted into hydrogen peroxide in the intestines and helps control the pH in the intestines.

Reasons for the increase in the content of peptostreptococci

Eating a lot of carbohydrates
Intestinal infections
Chronic diseases of the gastrointestinal tract

Enterococci

Norm of enterococci

Enterococci are involved in the processing of carbohydrates, in the production of vitamins, and also play a role in creating local immunity (in the intestines). The number of enterococci should not exceed the number of Escherichia coli, if their number increases, they can cause a number of diseases.

Causes of an increase in the content of enterococci

Decreased immunity, immune diseases
food allergies

Helminthiases
Treatment with antibiotics (in case of resistance of enterococci to the antibiotic used)

Improper nutrition
Decreased number of Escherichia coli (Escherichia)

Staphylococci ( saprophytic staphylococci and pathogenic staphylococci )

Norm of saprophytic staphylococci

The norm of pathogenic staphylococci

Staphylococci are divided into pathogenic and non-pathogenic. Pathogenic include: golden, hemolytic and plasma coagulating, golden is the most dangerous. Non-pathogenic staphylococci include non-hemolytic and epidermal.

Staphylococcus does not belong to the normal intestinal microflora, it enters the body from the external environment along with food. Staphylococcus aureus, getting into the gastrointestinal tract, usually causes toxic infections.

The human intestine is inhabited by ~3 kg of bacteria. They represent the microflora necessary for normal digestion, but with various failures, the number of some microorganisms can noticeably decrease - dysbacteriosis occurs - an imbalance of bacteria.

Although doctors do not attribute it to independent diseases, the harm from this does not decrease. If intestinal dysbacteriosis is suspected, special stool tests are prescribed to establish an accurate diagnosis.

Microorganisms living in the gastrointestinal tract are of paramount importance for human life. They synthesize vitamins, break down food and protect against attacks by pathogenic strains.

In other words, man and bacteria are in symbiosis. But if the composition of the microflora is disturbed, flatulence, diarrhea, nausea may occur, not to mention the consequences of insufficient intake of nutrient compounds in tissues.

The purpose of fecal analysis is to determine the qualitative and quantitative composition of bacteria in the intestine.

For this, 3 methods are usually used in medicine:

Coprogram.
bacteriological analysis.
Biochemical analysis.

Coprogram

A coprogram is prescribed when a person contacts with complaints of chronic or acute stool disorder, abdominal pain of an incomprehensible nature, a sharp weight loss for no apparent reason.

Doctors also resort to such a study in the treatment of diseases not related to the gastrointestinal tract. This is especially true when treating pathologies with antibiotics in different parts of the body (throat, joints, etc.).

A coprogram is a primary examination, which is only an auxiliary method and gives a physical description of the contents of the intestine.

The analysis is carried out in 2 stages:

2. Microscopic:

cells and tissue fragments;
digested food (fiber, fat, salt, starch, etc.).

If the coprogram shows deviations from the norm, the doctor has a reason to conduct a more thorough analysis. In the laboratory, feces are cultured on a nutrient medium.

After 4-5 days, the bacteria will multiply, which will allow their colonies to be examined under a microscope. After that, the specialist makes a conclusion about the number of microbes in 1 g of feces (CFU / g).

Based on the data obtained, the doctor makes a diagnosis. The results of analyzes of adults and children often differ, so the age of the patient must be taken into account.

But a 5-day wait for the growth of colonies is not always permissible, because during this time a person's condition can deteriorate significantly.

Biochemical analysis of feces

Biochemical analysis of feces for dysbacteriosis gives the result on the day of sampling. The essence of such a study is to identify compounds present in the intestine.

Particular attention is paid to the spectrum of fatty acids, because they are synthesized by bacteria in the process of life. Another biochemical analysis is called express diagnostics.

The method is very informative and simple, it not only demonstrates the imbalance of the microflora, but also determines the part of the intestine in which the failure occurred.

Doctors are much more likely to prefer this study due to its significant advantages:

Speed. The results will be in 1-2 hours.
Sensitivity. The method very accurately determines the concentration of compounds.
Undemanding to the freshness of the samples. Even yesterday's feces will do.

The reliability of the results of the study directly depends on proper preparation. The fact is that many foods contain substances that will give a positive reaction.

First of all, it's meat. It contains hemoglobin.

Secondly, it is iron. All red products contain this element. It is worth refraining from eating such dishes for 3 days before the analysis, so that the laboratory does not accidentally get a false positive result.

Restrictions also apply to raw vegetables and fruits: during the preparation period, you need to eat only thermally processed plant foods.

In addition, the patient must stop taking medications that directly affect the intestinal microflora:

antibiotics;
probiotics;
laxatives (official and folk);
rectal suppositories.

Adults prepare for the analysis of feces for dysbacteriosis on their own. The study of the contents of the children's intestines is no different, however, parents will have to monitor compliance with all recommendations by the child.

How to take a stool test for dysbacteriosis?

Diet and drug withdrawal are the primary conditions for the reliability of the analysis results. In addition, the patient will need to collect feces in accordance with the rules.

We hand over feces - 6 rules:

Before control defecation, wash the perineum (the possibility of getting old samples is excluded).
It is forbidden to use any aids to speed up the process of defecation (enema, laxative).
A special container with a tight lid is prepared in advance (must be purchased at a pharmacy).
Do not allow liquid to enter the feces (urine, water, etc.).
Take 3 stool fragments (1 teaspoon from different areas).
If blood or mucus is present, then such samples are taken without fail.

Gut bacteria are mostly anaerobic. 1 hour after defecation, they will still retain their natural population, but gradually the microorganisms will begin to die.

In order to correctly pass a fecal analysis for dysbacteriosis, it is necessary to deliver excrement samples to the laboratory at least within 2 hours after emptying.

Urgency is not so essential for biochemical research, which studies not colonies of bacteria, but the result of their vital activity - fatty acids. These compounds almost do not spontaneously decompose, and therefore remain unchanged for a long time.

Doctors even allow you to freeze feces and bring it the next day. In the case of newborn children, this option is sometimes the most preferable for parents.

The gut contains 100 trillion bacteria, which is 10 times the number of all cells in the body. If there are no microbes at all, then the person will simply die.

On the other hand, a balance shift in any direction leads to diseases. Deciphering the analysis of feces for dysbacteriosis is to determine the number and types of microbes.

Table for deciphering the results and norms of analysis

	Children under 1 year old	older children	adults
bifidobacteria	10 10 – 10 11	10 9 – 10 10	10 8 – 10 10
lactobacilli	10 6 – 10 7	10 7 – 10 8	10 6 – 10 8
Escherichia	10 6 – 10 7	10 7 – 10 8	10 6 – 10 8
Bacteroids	10 7 – 10 8	10 7 – 10 8	10 7 – 10 8
Peptostreptococci	10 3 – 10 5	10 5 – 10 6	10 5 – 10 6
Enterococci	10 5 – 10 7	10 5 – 10 8	10 5 – 10 8
Saprophytic staphylococci	≤10 4	≤10 4	≤10 4
Pathogenic staphylococci	-	-	-
Clostridia	≤10 3	≤10 5	≤10 5
candida	≤10 3	≤10 4	≤10 4
Pathogenic enterobacteria	-	-	-

Detailed transcript:

1. Bifidobacteria:

95% of all bacteria living in the intestine;
synthesize vitamins K and B;
promote the absorption of vitamin D and calcium;
strengthen immunity.

2. Lactobacillus:

maintain acidity;
synthesize lactase and protective substances.

3. Escherichia:

synthesize vitamins K and B;
promote the absorption of sugars;
produce colicins, proteins that kill microbes.

4. Bacteroids:

break down fats;
perform a protective function.

5. Streptococci:

break down carbohydrates;
perform a protective function;
are present in small quantities and not always.

6. Enterococci:

break down carbohydrates.

7. Peptococci:

participate in the synthesis of fatty acids;
perform a protective function;
are not always present.

8. Staphylococci:

live in the large intestine;
participate in nitrate metabolism;
There are many pathogenic strains.

9. Clostridia:

live in the large intestine;
synthesize acids and alcohols;
break down proteins.

10. Fungal:

maintain an acidic environment;
conditionally pathogenic.

A change in the number of certain microorganisms is possible when pathogenic strains enter the intestine.

This usually happens when personal hygiene is not observed (dirty hands, unwashed fruits and vegetables). Antibiotic treatment is the second most common cause of dysbacteriosis.

To normalize the situation in the gastrointestinal tract, doctors additionally prescribe probiotics - special dietary supplements.

In addition, dysbacteriosis often indicates an immune failure. Leukocytes control the population of microbes, the number of which increases significantly with a decrease in natural protection. And often not beneficial bacteria multiply, but pathogenic ones.

Analysis of feces in children

The results of the analysis of feces for dysbacteriosis in children are somewhat different than in adults. This is due, first of all, to the gradual colonization of the intestine by microorganisms.

After birth, the child feeds on mother's milk, which contributes to the development of normal microflora. But in hospitals, infection with Staphylococcus aureus often occurs.

And if the mother does not have antibodies to this microorganism, then the baby will develop dysbacteriosis.

In addition, some useful strains appear only within 1 year, such as bacteroids. Sometimes fungi of the genus Candida develop excessively in the intestines of a child, which provoke a corresponding disease - candidiasis.

The most common cause of dysbacteriosis in children is an early transition to artificial feeding. Still, the baby needs mother's milk in the first year of life.

Conclusion

Analysis of feces for dysbacteriosis is prescribed for any digestive disorders. In addition, doctors monitor the state of the patient's microflora during antibiotic therapy.

Timely detection of dysbacteriosis and clarification of the nature of the disorder will make it possible to take the right steps and reduce the likelihood of complications.

In the intestines of an adult, on average, from 2.5 to 3.5 kg of various bacteria live. The totality of these microorganisms is called microflora, and our health and well-being directly depend on the ratio of the number of its individual representatives. An imbalance in the intestinal microflora or simply dysbacteriosis is a very common problem in the modern world, but it is a mistake to consider it an independent disease. From the point of view of the medical community, dysbacteriosis is only a condition (most often temporary), against which a person can develop diseases. To prevent this from happening, at the first characteristic signs of trouble in the intestines, it is recommended to take a stool test for dysbacteriosis, the decoding of the results of which will allow the doctor to decide on further diagnostic and therapeutic tactics.

Success largely depends on how carefully the patient prepared for the stool test and whether he collected the material correctly. When it comes to diagnosing intestinal dysbiosis in infants and young children, there is a need to discuss some subtleties. Today we will tell you what signs and symptoms are indications for such a study, what the analysis of feces for dysbacteriosis shows (decoding of the results and norms in the table), how imbalances in the intestinal microflora are determined, for what reason they occur and what consequences they can lead to .

Please note that the information provided is for informational purposes only and does not replace the need for qualified medical assistance. Dysbacteriosis is a serious pathological condition that has a detrimental effect on digestion, metabolism, immune status and many other aspects of human health, and therefore requires a visit to a doctor!

The trillions of bacteria living in our body are in symbiotic interaction with us, that is, they receive their benefit from the host, while simultaneously benefiting him. But this statement is true in relation to all microorganisms to varying degrees: some of them are more welcome guests for humans, some are less, and some are completely “persona non grata”. An analysis of feces for dysbacteriosis is precisely carried out in order to establish the numerical ratio between the colonies of bacteria that inhabit the intestines.

Indications for the appointment of the study:

Heaviness, discomfort, bloating, abdominal pain;

Suspicion of an intestinal infection;

Sudden weight loss for no apparent reason;

Intolerance to certain foods;

Allergic reactions, skin rashes;

Visible pathological impurities in the feces (mucus, blood, pus).

It is highly desirable to take a stool test for dysbacteriosis after undergoing long-term therapy with antibacterial or hormonal agents - deciphering the results of the study will determine how much the treatment affected the composition of the intestinal microflora, whether its correction is required.

Three methods are used for this:

Bacteriological analysis of feces- in other words, sowing in a nutrient medium. After 4-5 days, the bacteria will multiply, and the laboratory assistant will be able to draw a conclusion about the number of the main representatives of the intestinal microflora in 1 gram of the material (CFU/g). It is this study that we are talking about today - it is simple and affordable, performed in any hospital and still serves as the leading way to determine dysbacteriosis in children and adults. However, such an analysis requires very strict adherence to the rules for the preparation and collection of material, and also takes too much time, so an alternative method was invented;

Biochemical analysis of feces is a modern diagnostic procedure based on gas-liquid chromatography of fatty acids by spectrum. Deciphering the results of the study becomes possible after a few hours, it reflects, among other things, the balance of the parietal microflora of the intestine. Fecal biochemistry is a more sensitive and accurate technique, even yesterday's sample is suitable for it, since the fatty acids secreted by bacteria during their life activity remain unchanged for a long time. Biochemical analysis of feces for dysbacteriosis even allows you to establish a specific section of the intestine in which the failure occurred. The only drawback of the method is that it is not available in every laboratory.

The norms of biochemical analysis of feces are presented in the table:

It is very important not only to correctly collect feces for analysis for dysbacteriosis, but also to deliver the sample on time, as well as to observe all the details of preparation.

Let's start in order:

If you have been treated with antibiotics, keep in mind that it makes sense to take a stool test to determine imbalances in the intestinal microflora no earlier than two weeks after the end of therapy;

Three days before the examination, it is necessary to abandon the use of laxatives, antidiarrheal and anthelmintic drugs, NSAIDs, pro- and prebiotics, castor and vaseline oils, barium and bismuth preparations;

It is necessary to purchase in advance at the pharmacy or get in the laboratory a sterile plastic container with a spoon and a tight-fitting lid, specially designed for collecting and transporting feces for analysis;

Defecation should take place naturally, without the use of enemas or any other aids;

Do not collect a sample for analysis from a toilet bowl. For these purposes, you need to prepare any convenient container, which should be thoroughly washed, poured over with boiling water, dried, and defecate into it;

Before starting the process, you must urinate, then wash and dry yourself. In no case should the collected sample contain urine or secretions from the genital tract. If a woman is menstruating, a tampon should be used;

When defecation has taken place, it is necessary to open the prepared container, take a spoon and collect a little bit of material from different parts of the stool: from the middle, from the surface. If you see a suspicious area containing mucus or blood that differs in consistency or color from the surrounding feces, be sure to place it in a container! In total, 6-8 spoons of feces will be needed for analysis;

Close the container tightly and deliver the sample to the laboratory no later than 2 hours after collection.

Most of the bacteria that make up the intestinal microflora are anaerobic, therefore, under the influence of open air, they gradually die. That is why it is so important to take a stool test for dysbacteriosis on time - only then the decoding of the results will be reliable.

If you are undergoing a biochemical study, the urgency is not so significant - you can even freeze the sample and bring it to the laboratory the next day. This is especially convenient for parents of infants and small children, because it is not known whether it will be possible to collect feces from a child for analysis early in the morning - perhaps he simply does not want to go to the toilet.

Analysis of feces for dysbacteriosis in infants

The norms of bacteriological examination of feces in newborns, infants and older children are somewhat different from the same indicators in adults, and the younger the child, the more pronounced these differences. They are associated with the gradual colonization of the child's body by bacteria. And this process, in turn, takes place in different ways in babies who are naturally or artificially fed. We will talk about this in more detail when deciphering the results of the analysis of feces for dysbacteriosis in the table.

The composition of the intestinal microflora of infants may undergo undesirable changes due to infection with nosocomial infections: Staphylococcus aureus, Pseudomonas aeruginosa, yeast-like fungi, and so on. At best, this will lead to temporary and minor health problems, and at worst, to a serious illness. Therefore, parents need to carefully monitor the behavior and well-being of the baby, the condition of his skin and mucous membranes, the frequency and appearance of bowel movements, especially if you have recently had a chance to undergo treatment in a hospital.

It is necessary to take a stool test for dysbacteriosis in an infant if the following symptoms are present:

Frequent and severe eructation after feeding, more like vomiting;

Bloating and colic in the abdomen, flatulence;

poor appetite;

Difficulties with the introduction of complementary foods;

Signs of intolerance to individual products;

Rashes, spots on the skin and / or mucous membranes;

Recent antibiotic or hormonal therapy;

Any problems with the stool - frequency disturbances, abnormal appearance or smell of feces, the presence of pathological impurities (blood, mucus, pus).

In order for the decoding of the results of the study to give objective results, it is necessary to properly prepare for the analysis:

Refuse to introduce new complementary foods at least 3-4 days before the visit to the laboratory;

On the eve, do not give your baby vegetables or fruits that can change the color of bowel movements (carrot puree, red and black berries, beetroot juice, and so on);

Finish taking any medications a few days before the test, including laxatives and vitamins. It is desirable to finish antibiotic therapy 2 weeks before the study. It is better to inform the doctor about all the medicines taken by the child and consult on the timing of the fecal analysis for dysbacteriosis;

Get a sterile plastic container with a spoon. It is acceptable to take a sample of baby stool from the surface of the diaper, but only if the filler is not gel. It is better to use a clean cotton diaper, before ironing it with a hot iron. To conduct the study, it is enough to collect 2 spoons of material.

Table of norms for bacteriological analysis of feces

flora type	Index	babies	Children over 1 year old	Adults
Useful flora
Useful flora
Conditionally pathogenic flora











Pathogenic flora		negative (none)	negative (none)	negative (none)
		negative (none)	negative (none)	negative (none)
		negative (none)	negative (none)	negative (none)
		negative (none)	negative (none)	negative (none)
		negative (none)	negative (none)	negative (none)
		negative (none)	negative (none)	negative (none)

All intestinal microflora can be divided into three groups:

Beneficial bacteria- they play an extremely positive role in the life of the human body, so it is very important that they be enough. We are talking about bifidobacteria and lactobacilli;

Opportunistic bacteria- some of them, being in balance with other participants in the microflora, even bring certain benefits. But as soon as their colonies multiply too much, and the colonies of antagonists thin out, these bacteria turn from conditional enemies into real enemies. Especially often this happens against the background of a decrease in immune protection. We are talking, for example, about candida, enterococci or clostridia;

Pathogenic bacteria- they should not be in the body of a healthy person. There is no benefit from them, only problems. If the immune system fails to cope with the attack of such microorganisms, this will lead to the development of a serious disease. We are talking about golden, salmonella, shigella and other "unwanted guests" of the intestine.

Now consider the main representatives of the intestinal microflora in more detail. In the form with the results of the analysis of feces for dysbacteriosis, some of the following bacteria may be absent - laboratories have different rules, especially private ones. Therefore, it is better to entrust the decoding of the indicators to a qualified doctor, and here we just give the established norms and indicate the reasons for possible deviations.

The name of this microorganism comes from the Latin words "bacterium" and "bifidus", that is, "divided in two." Indeed, bifidobacteria has the appearance of a curved stick 2-5 microns long, forked at the ends. It belongs to the class of gram-positive anaerobes. The intestinal microflora of a healthy person is approximately 95% composed of bifidobacteria. The norms for babies up to a year are 10 to the tenth or eleventh degree CFU / g, and for older children and adults - 10 to the ninth or tenth degree CFU / g.

Deficiency of these beneficial bacteria is the main reason for going to the doctor with complaints of intestinal problems and referral for fecal analysis for dysbacteriosis - deciphering the results almost always indicates a decrease in their number. Without a sufficient amount of bifidobacteria, the absorption of vitamins and microelements is disrupted, carbohydrate metabolism suffers, local immunity decreases, and the toxic load of the liver and kidneys increases. Correcting the intestinal microflora and replenishing the deficiency of bifidobacteria is quite simple - there are many specialized preparations for this.

Bifidobacteria in feces are reduced - causes:

Long-term therapy with antibiotics, hormones, NSAIDs, laxatives, antihelminthics;

Irrational nutrition - an excess of carbohydrates or fats in the diet, starvation, rigid mono-diets;

Artificial feeding of infants, too early introduction of complementary foods;

Congenital fermentopathy - intolerance to lactose, fructose, gluten and other food components;

Immunodeficiency states, allergies;

Chronic diseases of the gastrointestinal tract - cholecystitis, pancreatitis,;

emotional stress;

Abrupt climate change.

The name of these beneficial members of the intestinal microflora comes from the Latin word "lac", which means "milk". There are many species of them that inhabit, including other internal organs, for example, female genital organs. Lactobacilli are gram-positive facultative anaerobic microorganisms, look like thin sticks and make up about 3% of the total mass of all bacteria living in the intestine. According to the decoding of the analysis of feces for dysbacteriosis, the norm of their content in infants is 10 to the sixth or seventh degree CFU / g, and in adult patients - 10 to the seventh or eighth degree CFU / g.

Lactobacilli produce organic acids, thereby maintaining the correct pH balance in the intestines. In addition, they are involved in membrane digestion, namely, they break down milk sugar, preventing the occurrence of lactase deficiency. Normal assimilation of milk is in principle impossible without a sufficient amount of lactobacilli. A person also needs them as stimulants of local immunity, because, being foreign elements, they spur the activity of immunocompetent cells that inhabit the parietal zone of the intestine. Lactobacilli are also involved in the metabolism of bile acids, contribute to normal peristalsis, prevent feces from becoming too hard, and therefore indirectly prevent the development of constipation.

Lactobacilli in feces are reduced - causes:

Long-term antibiotic therapy without the support of pre- and probiotics, uncontrolled use of NSAIDs (aspirin, analgin, ibuprofen), the use of laxatives or anthelmintic drugs;

Unbalanced diet, starvation, mono-diets;

Artificial feeding or too early introduction of complementary foods in infants;

Acute intestinal infections;

Chronic diseases of the gastrointestinal tract;

Strong stress.

These bacteria belong to the opportunistic flora, they are small round-shaped cells that stray into short chains and are able to move with the help of movement organelles - cilia. Peptostreptococci are gram-positive non-spore-forming anaerobes, they live in the oral cavity, vagina, intestines and on the skin, while accounting for up to 18% of all gram-positive anaerobic cocci living in the human body. When deciphering the results of fecal analysis for dysbacteriosis, the norm for peptostreptococci in children under one year old is a maximum of 10 to the fifth degree CFU / g, and in adults - a maximum of 10 to the sixth degree CFU / g.

Peptostreptococci play a modest role in the metabolism of proteins and carbohydrates, as well as the production of hydrogen, which is necessary to maintain a healthy acid-base balance in the intestine. However, their number must be strictly controlled by the immune system and other members of the microflora. Excessively multiplied colonies of peptostreptococci can cause mixed abdominal infections together with other opportunistic and pathogenic bacterial strains. For example, peptostreptococci appear in 20% of cases of peritonitis. They are also sown in gynecological inflammatory diseases, as well as in purulent abscesses in the oral cavity.

Peptostreptococci in feces are increased - causes:

Acute intestinal infection;

Chronic diseases of the gastrointestinal tract;

Too much sugar in the diet.

Escherichia coli (Escherichia coli, Escherichia typical) is a gram-negative facultative anaerobic non-spore-forming bacterium, most strains of which are conditionally pathogenic and act as a natural participant in the microflora of internal organs. Already within the first forty hours after birth, the intestines of the child are populated by Escherichia. When deciphering the results of a fecal analysis for dysbacteriosis, the E. coli content in infants is 10 to the sixth or seventh degree CFU / g, and in older babies and adults - 10 to the seventh or eighth degree CFU / g. In comparison with other microorganisms, E. coli forms up to 1% of the total mass of bacteria living in the intestine.

A typical Escherichia benefits a person: it is involved in the synthesis of vitamins B and K, in the metabolism of cholesterol, bilirubin and choline, in the process of absorption of iron and calcium. E. coli produces a number of essential acids (acetic, lactic, succinic, formic), colicin substances that are harmful to pathogenic bacteria, and also takes excess oxygen from the intestine, which is harmful to lactobacilli and bifidobacteria. That is why, despite the opportunistic status of E. coli, its deficiency is highly undesirable.

Escherichia in the feces are lowered - the reasons:

Long-term therapy with antibacterial drugs;

Acute intestinal infection;

Unbalanced diet;

Artificial feeding of babies.

The presence of this strain in the interpretation of the results of the analysis of feces for dysbacteriosis is quite acceptable. The norm for the content of lactose-negative Escherichia coli in the intestines of children and adults is no more than 10 to the fifth degree CFU / g. Exceeding this indicator is an alarming sign, especially in combination with a deficiency of full-fledged Escherichia. The lactose-negative strain does not perform the functions that are assigned to E. coli, but simply takes up space to no avail. In conditions of reduced immunity, Escherichia coli - "parasite" will act on the side of harmful bacteria and aggravate the course of the inflammatory process, if one begins. In young children, an increased content of lactose-negative Escherichia in the feces indirectly indicates helminthic invasion, so a similar result of the analysis requires additional examination.

They belong to gram-negative anaerobes, are polymorphic, and do not have organelles of movement, do not form spores and capsules. In appearance, fusobacteria are thin sticks 2-3 microns long with pointed ends. These are natural participants in the microflora of the oral cavity, upper respiratory tract, gastrointestinal tract and genital organs. According to the standards of fecal analysis for dysbacteriosis, in the intestines of infants, the content of fusobacteria is allowed up to 10 to the sixth degree CFU / g, adult patients - up to 10 to the eighth degree CFU / g.

Fusobacteria are conditionally pathogenic, while they do not perform any useful function in the human body, unless they enter into competitive interaction with other, more potentially dangerous microorganisms. Some types of fusobacteria in conditions of immunodeficiency are capable of provoking purulent-septic inflammations. In debilitated children and the elderly with severe angina, a formidable complication can develop - fusospirochetosis. This is a necrotic process that affects the mucous membranes of the mouth and throat.

These are opportunistic gram-negative rod-shaped anaerobes. They are the second largest members of the natural intestinal microflora after bifidobacteria. Deciphering the results of fecal analysis for dysbacteriosis implies the following norms for bacteroids: in children under one year old - 10 to the seventh or eighth degree CFU / g, in adult patients - 10 to the ninth or 10 to the tenth degree CFU / g. It is noteworthy that in babies up to 6-8 months of age, these bacteria are not sown, especially if the child is breastfed and does not receive early complementary foods.

Bacteroids in normal concentration are useful - they take part in the metabolism of fats. But if they multiply excessively, they will begin to compete with E. coli for oxygen, and this threatens with digestive disorders, vitamin and microelement deficiencies, decreased local immunity and other problems (we talked about the beneficial role of typical Escherichia above). The growth of the population of bacteroids is restrained by their direct antagonists - lactobacilli and bifidobacteria. Therefore, if the results of the analysis of feces for dysbacteriosis indicate an excess of the concentration of bacteroids in the intestine, it is recommended to drink a course of appropriate drugs to restore healthy microflora.

Bacteroids in feces are increased - causes:

Excessive consumption of fats;

Deficiency of bifido- and lactobacilli.

Bacteroids in feces are reduced - reasons:

Long-term therapy with antibacterial agents;

Acute intestinal infection;

Gram-positive anaerobes, shaped like thick short columns or flattened spheres, have rigid cell walls, do not form spores. Eubacteria are representatives of the natural intestinal microflora, however, they are opportunistic, since some of their strains can provoke inflammatory processes in the oral cavity, respiratory system, genitals, joints, heart, brain, and can also cause postoperative complications. The norms for the content of eubacteria in the intestine when deciphering the results of fecal analysis for dysbacteriosis are as follows: for infants - 10 to the sixth or seventh degree CFU / g, for older children, adults and the elderly - 10 to the ninth or tenth degree CFU / g.

From these figures, it becomes obvious that eubacteria are a fairly numerous representative of the intestinal microflora. It is noteworthy that in breastfed babies under one year old, these bacteria are rarely sown, while in artificial children they are almost always present. Eubacteria in the right concentration are useful for the body - they are involved in the metabolism of cholesterol and hormonal metabolism, synthesize important organic acids, ferment carbohydrates, produce vitamins, and break down cellulose. However, their excessive amount, especially in conditions of reduced immune protection, can be hazardous to health.

An excess of the content of eubacteria in the feces is a specific marker of the presence, therefore, it necessarily requires additional examination (sigmoidoscopy, colonoscopy).

Gram-positive facultative anaerobic cocci habitually paired or in chains that do not form spores. Enterococci belong to the conditionally pathogenic flora, are present in the intestines of people of any age and make up to 25% of all coccal forms living there. Normal indicators of the content of enterococci in deciphering the analysis of feces for dysbacteriosis: in infants - from 10 to the fifth degree to 10 to the seventh degree CFU / g, in older children and adult patients - from 10 to the fifth degree to 10 to the eighth degree CFU / g.

Enterococci perform some useful functions: they are involved in carbohydrate metabolism, vitamin synthesis, and maintaining local immunity. However, the population of enterococci should not exceed the population of Escherichia coli, otherwise the latter will begin to die in a competitive confrontation. The opinion of doctors regarding the harmlessness of enterococci has recently lost its relevance. Mutated strains have emerged that are resistant to the most powerful antibiotics: beta-lactam penicillins, cephalosporins, aminoglycosides, and even vancomycin. Cases of nosocomial infections, postoperative complications and inflammatory diseases caused by enterococci, including meningitis and endocarditis, are known.

Enterococci in feces are increased - causes:

Immunodeficiency states;

Irrational nutrition;

Long-term antibiotic therapy;

Staphylococcus saprophytic and epidermal

Gram-positive facultative anaerobic cocci up to 1.2 µm in diameter, non-spore-forming, immobile, grouped like grapes. Saprophytic staphylococcus lives mainly in the genitourinary tract, and epidermal, as the name implies, on the surface of the skin and mucous membranes. Both of these species belong to opportunistic microflora and can normally be present in deciphering the results of fecal analysis for dysbacteriosis: up to 10 to the fourth degree CFU / g in children and adults.

As long as these staphylococci are controlled by the immune system, they cannot cause significant harm to human health. But they are of no use either. Colonies of saprophytic staphylococcus that have multiplied in the intestines can cause acute cystitis or urethritis with improper wiping after the toilet, and epidermal, for example, as a result of rubbing the eyes with dirty hands. Exceeding the content of these types of staphylococcus in the feces is definitely an unfavorable sign, and if it is significant, then the patient may need antibiotic therapy.

Gram-negative anaerobic cocci, very small, immobile and non-spore-forming, habitually grouped in irregular spots. Veillonella are opportunistic microorganisms and peacefully coexist with humans, however, some of their strains can provoke purulent-septic inflammatory processes. When deciphering the results of fecal analysis for dysbacteriosis, the following norms are used: for babies up to a year - less than or equal to 10 to the fifth degree CFU / g, for older children and adults - 10 to the fifth or sixth degree CFU / g. It is noteworthy that under the condition of natural feeding, veillonella is sown in less than half of the babies.

These bacteria have a useful function - they break down lactic acid. In addition, there are scientific studies that indicate an indirect relationship between veillonell deficiency and the risk of developing asthma in children. But there are types of these bacteria that have pronounced periodontogenic properties - microbes accumulate in dental plaques, cause inflammation of the gums and loss of teeth. And, for example, Veillonella parvula provokes colitis in humans. In addition, even beneficial strains of veillonella in conditions of overabundance in the intestines lead to increased gas formation, and diarrhea.

Gram-positive obligate anaerobic rod-shaped bacteria capable of reproducing by endospores. The name "clostridia" comes from the Greek word for "spindle", and this is not accidental: located in the center of the dispute, as a rule, it has a larger diameter than the cell itself, which is why it swells and becomes like a spindle. The genus Clostridia is very numerous - among them there are both representatives of conditionally pathogenic flora and pathogens of dangerous diseases (tetanus, botulism, gas gangrene). The rate of clostridia content in feces when deciphering the analysis for dysbacteriosis is as follows: in infants - no more than 10 to the third degree CFU / g, in adults - no more than 10 to the fourth degree CFU / g.

Clostridia perform a useful function - they are involved in the metabolism of proteins. Metabolic products are substances called indole and skatole. In fact, these are poisons, but in small quantities they stimulate peristalsis, promoting fecal masses and preventing the development of constipation. If the concentration of clostridia in the intestine is too high, this will lead to putrefactive dyspepsia, the striking symptoms of which are watery diarrhea with a rotten smell, nausea, bloating, flatulence, colic, sometimes -. Against the background of weakened immunity and in association with other pathogenic bacteria, clostridia can cause necrotizing enterocolitis, urethritis, and many other inflammatory diseases.

Yeast-like fungi-deuteromycetes, unicellular microorganisms of a round or oval shape, forming pseudomycelium, that is, long thin threads. The most common species are Candida albicans and Candida tropicalis. They inhabit the human body during the first year of life, live on the mucous membranes of the oral cavity and genital organs, as well as in the intestines. Candida is a bright representative of conditionally pathogenic flora. When deciphering the results of fecal analysis for dysbacteriosis, it is customary to adhere to the following standards: no more than 10 to the fourth degree CFU / g for patients of any age.

Candida are involved in the regulation of pH levels, so if their number is within acceptable limits, they benefit a person. But if yeast-like fungi multiply too much, this will lead to the development of local or even systemic candidiasis. Fungi affect the oral cavity (candidiasis stomatitis), rectum (candidiasis proctitis), vagina ("thrush") and so on. All these diseases, in addition to being extremely unpleasant, accompanied by itching, pain and discharge, are also difficult to treat. After all, yeast-like fungi are one of the most tenacious and rapidly multiplying microorganisms.

Increased candida in feces - causes:

Abuse of carbohydrates, love of sweets;

Long-term antibiotic therapy without antifungal support;

Use of hormonal contraceptives;

emotional stress;

Climate change.

Other opportunistic bacteria

As a result of stool culture, other opportunistic microbes can be detected in the nutrient medium, for example, Klebsiella, hafnia, serrations, proteas, enterobacters, citrobacters or morganellas. All of them are lactose-negative bacteria with varying degrees of potential health hazard. Normally, their total content in the intestine should not exceed 10 to the fourth power CFU / g. If the analysis shows an upward bias, the culprit bacterium is entered on the results sheet as an additional indicator. A significant increase in the number of opportunistic flora (10 to the sixth degree CFU/g or more) requires additional examination and treatment.

The most unpleasant representatives of this group of bacteria:

- antagonists of lactobacilli, cause allergies, constipation, lactase deficiency. Give themselves green and sour smell of stools, the presence of mucus in them (fermentative dyspepsia);

Protea- lead to the development of constipation, can cause acute intestinal infection with febrile syndrome. When it enters the urinary tract, it provokes cystitis, prostatitis,.

Gram-negative facultative anaerobic non-spore-forming bacteria, have the form of thin rods up to 7 microns long, can move with the help of flagella.

Pathogenic for humans, normally, when deciphering the results of the analysis of feces for dysbacteriosis, salmonella should be absent! These microbes cause a serious illness - an acute intestinal infection of the same name.

You can get salmonellosis from a sick person, as well as as a result of eating infected meat, milk, poultry or eggs. It is chicken eggs that are the leading source of the spread of salmonella, so their heat treatment is simply necessary, especially if the dish is offered to a small child. Freezing, salting and smoking meat does not lead to the destruction of salmonella! It also requires long cooking, stewing or baking.

Gram-negative, facultative anaerobic, immobile, non-spore-forming bacteria, in appearance they are short (up to 3 microns) rods with rounded ends. Shigella are relatives of Salmonella, they belong to the same family, and are also pathogenic to humans.

In the form with the results of the analysis of feces for dysbacteriosis, there should be a minus opposite shigella - normally, these bacteria are absent! They cause the disease shigellosis, better known as dysentery. This is an acute intestinal infection with high fever, colic, nausea, and vomiting.

You can become infected with dysentery through the fecal-oral or contact-household route. Most often, from a sick person, through dirty water, unwashed hands, vegetables, fruits. Flies and cockroaches can also spread shigellosis.

Gram-negative facultative anaerobic rod-shaped bacteria 2-4 microns long, pathogenic for humans, when considering the results of fecal analysis for dysbacteriosis, there should be a dash or abbreviation “neg” in the “Yersinia” column.

These microbes provoke yersiniosis - an acute intestinal infection, the clinical picture of which consists of a febrile syndrome, dyspeptic disorders, abdominal pain and skin rashes.

Yersinia live in the soil, and people usually become infected with them as a result of domestic contact with sick pets (hamsters, rabbits, cats, dogs, parrots) or by eating food and water that the pet has come into contact with for some reason. You can become infected with yersiniosis in the process of caring for livestock (pigs, cows, chickens).

Gram-negative obligate aerobic motile bacterium in the form of short (up to 5 µm) straight or curved rods with rounded ends. Scientists disagree as to which group of microorganisms to attribute Pseudomonas aeruginosa: to opportunistic or pathogenic flora? If we talk about deciphering the results of fecal analysis for dysbacteriosis, then it is better if this bacterium is not sown.

Pseudomonas aeruginosa provokes the development of inflammatory processes in the gastrointestinal tract, urogenital area, respiratory tract, heart, soft tissues. It is the source of 20% of nosocomial infections, 25% of purulent-septic postoperative complications, 35% of all abscesses and phlegmon.

It is easiest to get infected with Pseudomonas aeruginosa from a sick person, by airborne droplets or by household contact. It is also transmitted through contaminated food and contaminated water.

Hemolytic or hemolyzing Escherichia is a type of Escherichia coli that is pathogenic for humans. The word "hemolysis", from which its name comes, means the death of red blood cells - erythrocytes. In the form with the results of the analysis of feces for dysbacteriosis, it should normally be indicated that the patient does not have hemolytic escherichia.

This microorganism causes the development of escherihosis, an acute disease that is accompanied by abdominal pain, nausea, diarrhea, vomiting, fever, and general weakness and dehydration. All these symptoms are the result of the toxic effects of hemolytic Escherichia coli.

It can be transmitted through contaminated food and water. It is comforting that for a large-scale disease it is necessary to get a fairly large number of Escherichia into the gastrointestinal tract, the disease proceeds quickly (3-6 days) and rarely causes complications. But for elderly debilitated patients and young children, hemolytic E. coli can pose a serious threat!

We want to complete our conversation today about deciphering the results of fecal analysis for dysbacteriosis with a description of the most insidious representative of the pathogenic intestinal flora - Staphylococcus aureus. Although, it would be more correct to attribute it to opportunistic bacteria, if only because a quarter of the world's population acts as its asymptomatic carrier, that is, Staphylococcus aureus can be restrained by the forces of immunity. Some doctors consider the content of this microbe in the studied stool sample at a concentration of 10 to the third degree CFU / g to be acceptable, but there are also experts who consider an exclusively negative indicator to be the norm.

Most people acquire the "intruder" in childhood, as a result of nosocomial spread of Staphylococcus aureus or infection with a bacterium in a preschool educational institution. The first hit of a large amount of the pathogen inside the body of a child or an adult after 4-5 hours causes vivid symptoms of an intestinal infection: nausea, vomiting, abdominal pain, diarrhea with mucus and bloody streaks, dehydration, high fever, weakness, lack of appetite, dizziness sometimes hypotension. It is very difficult to treat the disease - Staphylococcus aureus is extremely resistant to antibacterial drugs. Therapy usually involves the simultaneous normalization of the intestinal microflora and stimulation of the immune system, if required. To avoid such serious problems, it is necessary to carefully observe the rules of personal hygiene, especially when visiting public places, and teach your children to do this. Take care of yourself and be healthy!

Education: Moscow Medical Institute. I. M. Sechenov, specialty - "Medicine" in 1991, in 1993 "Occupational diseases", in 1996 "Therapy".

One of the methods for studying the state of human health is bacteriological studies of the products of its vital activity, including feces. This type of analysis is usually included in both general preventive examinations and complex narrow-profile diagnostic measures. The collected material, processed in a special way, makes it possible to determine some important indicators of human health, for example, the presence of intestinal dysbacteriosis or intestinal infections, as well as to control the quality of the treatment provided. Such an analysis can be prescribed to patients of any age.

What is the intestinal microflora for?

It is well known that in the human intestine there is a large number of various microorganisms, in total more than 500 species. Most of the microflora "live" in the large intestine, a smaller amount - in the small intestine and appendix.

Although, at first glance, it may seem that their functional significance for humans is not particularly important, in fact, the work of these bacteria is directly reflected in the health of their carrier.

In the intestinal cavity, bacteria attach to the villi of the epithelium. One of their functions is the production of a special mucous biofilm, which is responsible for maintaining the population of beneficial microorganisms and protecting them from external influences.

In the course of their vital activity, bacteria actively multiply, participating in the processes of digestion of food and the assimilation of nutrients by the human body.

In case of ingress of foreign microorganisms, “strangers” are destroyed, forced out, or their adaptation takes place, and they also begin to participate in the general life of intestinal bacteria.

In addition to the above, microorganisms in the intestine perform other functions - they break down and digest food, protect the epithelial inner layer of the intestine, participate in metabolic processes, synthesize some vitamins and amino acids, form immune system reactions, protect against various pathogenic organisms.

At the same time, part of the microbiota of the intestine itself is opportunistic, such as E. coli. In a normal amount, it is indispensable in the processes of digestion.

Any change in the quantitative or qualitative ratio of microflora in the intestine leads to a deterioration in human health.

Bacterial composition of the intestinal microflora

For convenience, all microorganisms that inhabit the intestinal cavity are classified by physicians according to whether they can pose any danger to their carrier under certain conditions.

Thus, distinguish:

healthy bacteria that function in the intestines and do not harm the carrier: lactobacilli, bifidobacteria, escherichia;
conditionally pathogenic microorganisms that can provoke the development of certain pathological processes under certain conditions: clostridia, staphylococci, candida, enterococci;
pathogenic, which are the causative agents of dangerous diseases: salmonella, shigella.

What is it for?

Analysis of feces for intestinal infections and dysbacteriosis allows you to identify all types of microorganisms, including pathogens. The essence of the examination is to sow the secretions of the human body on nutrient media, as a result of which all the bacteria present in the feces begin to multiply intensively, and it becomes easy to detect them. Often, a study, which is also called fecal culture, is prescribed for children.

Indications and contraindications for stool culture

The study of fecal masses is prescribed in certain cases when the doctor needs specific information about the patient's health status. Indications for the appointment of bacteriological examination of feces are:

the need for antibiotics;
preparation for the conception of a child;
the presence of digestive problems:, heartburn, nausea and, heaviness in the stomach:
stomach ache;
increased gas formation;
completed a course of antibiotic treatment;
manifestations of allergic reactions;
frequent infectious diseases, suspicion of the presence of helminths;
diagnosed oncological diseases;
immunodeficiency.

As for possible contraindications, this procedure does not have them - bacteriological examination of feces can be carried out at any age and in any condition of the patient.

Requirements for sampling material for analysis

Carrying out a bacteriological analysis of feces requires certain preparatory measures from the patient. Fecal masses are a product of the vital activity of the human body, which reflects the image of its nutrition.

Therefore, in order to ensure the most objective diagnosis, doctors recommend, first of all, to consult with your doctor and, about 5-7 days before taking feces for pathogenic intestinal flora, refuse to take antibiotics, anti-diarrhea drugs, anthelmintic drugs, laxatives , enzyme-containing and iron-containing drugs. It is not recommended to do cleansing or therapeutic enemas for 3-4 days. The doctor who will conduct the study should be warned about all medications taken shortly before the analysis. If the subject has visited other countries in the last six months before the analysis, this should also be reported to the doctor.

As part of the preparation of the patient, 2-3 days before the scheduled date for the test, you should follow a diet that excludes foods that increase gas formation or stain the feces. Forbidden:

legumes;
raw vegetables and fruits;
and confectionery;
and dairy products;
red fish.

When compiling a diet during this period, it should be remembered that eating meat can also affect the results of the analysis. It is not allowed to take feces for analysis, which is obtained using laxatives or enemas. All these recommendations are relevant for the planned sampling of material.

How is the collection of material for analysis by the patient

There are several ways to take feces for research. In the first case, the patient collects the biological material for study independently, after an arbitrarily performed defecation process. In this case, there are some requirements for the fence technique.

It is necessary to take care in advance of the availability of a special sterile container for the collected feces - in any pharmacy you can buy a container with a tight-fitting lid and a spatula.

It is very important that foreign impurities do not get into the feces sent for analysis - urine, menstrual flow, cleaning products from the toilet bowl. Women are advised to collect material after the end of menstruation.

If there is pus or mucus in the stool, they must be collected. Blood blotches or clots should not be collected for analysis. The bladder must be emptied before sampling.

For analysis, a mass of about 2-3 teaspoons is sufficient, while choosing the material from different parts of the mass - from the inside, from the sides, from above.

Having collected material for research in a container, it must be tightly closed with a lid. On the container, you should indicate your last name and initials, date of birth. Within no more than one and a half hours, the container with the contents must be delivered to the laboratory. Most often, special storage conditions cannot preserve the fecal microflora as much as possible, since most of the bacteria that enter it die from contact with oxygen. Five hours after sampling, the material is no longer of value for research.

Taking feces for analysis in a laboratory or hospital

In some cases, the sampling of material for research is carried out by a medical worker, regardless of the process of the patient's natural defecation. For this, tampons or special loops can be used. This algorithm for taking feces is also suitable for young children.

The fecal sampling technique looks like this: the subject lies on the couch, in the “on the side” position, bending the legs at the knees and pulling the hips to the stomach. He needs to spread his buttocks with his palms. To a depth of 10 centimeters, a loop or swab is inserted into the anus, which gently removes the contents of the intestine from the wall of the rectum.

The collected material is placed in a sterile test tube, container or container with a preservative. Without a preservative, the material must be processed no later than 2 hours after its removal.

How is the further processing of feces

After the material for analysis is received, it is sent to the laboratory in a sterile container.

As soon as possible from the moment of taking the stool, it is inoculated on a solid color medium - Levin's medium or bactoagar Zh, as well as on an accumulation medium (Kaufman, Muller). The crops made for a day are sent to a thermostat, where they are kept at a temperature of 37 degrees Celsius. If the stool was collected on a swab, it is applied to a cup with a solid colored medium and scattered with a spatula. A day later, the material is ready for research.

Technique for bacteriological and coprological examination of feces

Clinical analysis of feces includes their initial examination. At the same time, the doctor studies its structure, color, consistency, smell. Normally, feces should not contain pieces of undigested food, mucus, pus, be discolored or, conversely, too dark.

Biochemical analysis involves carrying out some chemical reactions, for example, reactions to the presence of bilirubin, occult blood, iodophilic flora. All these elements should normally show a negative reaction result.

Reactions to ammonia and stercobilin should be positive. Using a litmus surface, the physician determines the level of the acid-base state of the stool. In addition, the material is examined under a microscope. This method of studying feces allows you to identify the presence of pathological elements in the excrement. Fecal microscopy makes it possible to assess the quality of food digestion, to diagnose cystic fibrosis, dysbacterial and enzymatic disorders.

Bacteriological examination of feces is an analysis due to which it is possible to reveal the presence of a number of pathologies in a patient, including dysbacteriosis. In its normal state, the intestinal microflora is a balanced symbiosis of various types of microorganisms that are responsible for the functioning of the immune system, for the process of food processing, for maintaining a normal level of acidity and protective resources of the body. The danger of dysbacteriosis is that it destroys the intestinal microflora, as a result of which a person can even develop diseases such as dysentery or staphylococcal disease.

In addition to dysbacteriosis, this type of diagnosis shows the physician the nuances of the digestive process of the subject, the state of his intestines and stomach. Analysis of feces makes it possible to determine the presence of bleeding in the digestive organs.