Resumo

PAZ, M.; MUZIO, H.; TEVES, S.  e  SANTINI, P.. Analysis of a Yersinia enterocoliticaisolated from human diarreic feces in Argentina. Rev. argent. microbiol. [online]. 2004, vol.36, n.4, pp.164-169. ISSN 0325-7541.

Some serotypes of Yersinia enterocoliticamight causediarrheas and/or invasive infections. The aim of this work was to analyze virulence factors and associated markers in a strain of Y. enterocolitica isolated from human diarrheic feces. The strain analyzed was included in the biotype 1A. The virulence markers determinationas well as the search of the genes vir F and ail,were negatives. However, it was demonstratedenterotoxin production at 20 °C, andat 37 °C in osmolarity conditions and pH similar to the human intestine. The enterotoxin presented reactivity for the infant mouse test, although it could not be proven the presence of yst gene by PCR. The results obtained by us, coincident with those of other investigators,indicated that certain clinical isolates of Y. enterocolitica of the biotype 1A (“avirulent”), could be the etiological agent of the illness trhough other mechanisms of virulence, that would differ from those previously characterized in species of enteropathogenic Yersinia.

Palavras-chave : Yersinia enterocolitica; virulence factors; pathogenicity; enterotoxin.

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