Przegla̧d epidemiologiczny
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The aim of this paper was to assess the epidemiological situation of yersiniosis in Poland in 2013 against previous years. ⋯ Occurrence of a significantly higher number of yersiniosis cases during the third and fourth quarter of 2013 suggests the changes in seasonal distribution of infections in comparison to previous years. This may be related to a very low number of infections caused by serotype O8, reported in past years within the first half of the year. Maintaining a high percentage (47%) of a non-serotyped strains of Yersinia isolated from patients points to lack of serotyping in routine laboratory diagnostics. Reporting cases of extraintestinal yersiniosis from only few provinces may suggest that the real number of infections remains underreported.