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Stool analysis for pathogens: a modern method for detecting intestinal infections
What are pathogens in feces?
Pathogenic microorganisms are infectious agents that cause disruption of the gastrointestinal tract. These include bacteria (Salmonella, Shigella, Campylobacter), viruses (rotavirus, norovirus), vermin (giardia, helminths) and some fungi. Stool analysis for pathogens allows you to quickly identify the source of the disease, assess its risks, and initiate the correct treatment.
When is the analysis prescribed?
Examination is recommended in cases of:
prolonged or sudden diarrhea
fevers with signs of intestinal upset
the presence of mucus or blood in the stool
suspected food poisoning
before hospitalization or visiting the pool (as part of screening)
For children, the analysis is critically important if there is a decreased appetite, sudden weight loss, or suspected helminthic infestation.
Basic methods for pathogen detection
Bacteriological examination
A stool sample is plated on nutrient media and incubated for several days. This allows the pathogen to be identified and its sensitivity to antibiotics to be determined. The method is the «gold standard» for suspected salmonellosis, dysentery, and other bacterial infections.
PCR diagnostics (polymerase chain reaction)
This is a modern molecular technique that allows you to detect the genetic material of the pathogen (DNA or RNA) even in small quantities. Suitable for rapid detection of rotavirus, adenovirus, Clostridium difficile and other difficult-to-identify pathogens.
Enzyme-linked immunosorbent assay (ELISA)
Allows detection of antigens or antibodies to pathogens in feces. The method is convenient for mass testing or when it is necessary to confirm a diagnosis established by other methods.
Comparison of methods
| Method | Advantages | Disadvantages |
|---|---|---|
| Bacteriological | Detects live pathogens, available | Result 3–5 days, sensitivity not 100% |
| PCR | High accuracy and speed (1–2 days) | More expensive, does not determine the viability of the pathogen |
| ELISA | Suitable for screening | Lower sensitivity, depends on the stage of infection |
How to properly prepare for the analysis
Collect feces in a sterile container without foreign matter.
Do not use laxatives, enemas, or suppositories before delivery.
Deliver the material to the laboratory no later than 2 hours (or store in the refrigerator for up to 8 hours)
Tell your doctor about any antibiotics or probiotics you have recently taken.
For whom is this analysis especially important?
Preschool children with frequent infections
People after traveling to countries with increased epidemiological risk
Immunocompromised patients
Food industry or human care workers
Timely diagnosis of pathogens in feces allows not only to cure a specific patient, but also to prevent the spread of infections in a family, team or medical institution. Early detection is the key to effective treatment and prevention of complications.
