RESUMEN
Current issue deals with an interesting clinical case of a rare infectious disease in a Caucasian young male patient, caused by Yersinia enterocоlitica. Infection proceeded in the development of secondary focal form, which was accompanied by prolonged polyarthritis. We described a clinical case of secondary focal form with prolonged polyarthritis caused by Y. enterocolitica O:3 serogroup in young patient with the purpose of focusing on the early clinical and laboratory diagnosistics of Yersiniosis that would minimize the role of medical errors in diagnostics made by general practitioners. This case deserves the attention of internal medicine specialists, physicians of the specialty âªgeneral practitionersâ«, rheumatologists, infectious disease specialists taking into consideration the clinics and immunopathogenesis, as well as a high evidence of a prolonged clinical course and chronicity of this disease. It has accented on the feasibility of early serological diagnostics and etiotropic antibiotic therapy of the disease.