At the present time yersinioses have turned from a comparatively small problem of regional pathology into a global problem of interest for large circles of medical workers, specialists in different fields. The paper presents the main clinico-anatomic forms of yersiniosis and still scarce data on their pathology. These diseases, as a rule, have a benign course, their lethality not exceeding 0.04%. The importance of studying their pathology is emphasized because the correct diagnosis helps avoid serious errors in examining biopsy specimens.