This is a laboratory analysis of human feces, which is carried out by placing a biomaterial in a nutrient medium in order to determine the content of a set of pathogenic microorganisms in the intestine. The fecal test for the "dysgroup" implies the detection of the following pathogens: Salmonella, Shigella spp.,

Yersinia spp., and diarrheal E. coli 4. These pathogens are not only capable of causing intestinal disorders, but are also asymptomatic, thereby turning a person into a source of infection that can infect others.

Before taking a sample, the following preparation rules must be followed:

1. Fecal sample collection should be carried out immediately after defecation from a pre-disinfected, thoroughly washed, rinsed with boiling water, and air-cooled lining vessel or pot;
2. To exclude the collection of feces using toilet paper, because the presence of barium salts on the surface of toilet paper inhibits the growth of certain intestinal pathogens;
3. Exclude the possibility of contamination (mixing) of fecal samples with urine, as it is possible to obtain unreliable results;
4. The fecal sample is taken immediately after defecation using a spoon-spatula mounted in the lid of a sterile container. In the presence of pathological impurities, select areas containing mucus, pus, flakes, but free of blood. Remove liquid stool using a disposable Pasteur pipette.