[Yersinia enterocolitica and related species in the sewage discharge from the city of Buenos Aires: use of Schiemann medium in their isolation].

Schiemann's medium was used for the isolation of Yersinia enterocolitica and Yersinia enterocolitica-like organisms. These bacteria were isolated in 90% of the samples of sewage of the city of Buenos Aires, both from direct and cold enriched samples. From a total of 19 strains, 8 were classified as Y. enterocolitica (lactose positive), 7 as Y. frederiksenii and 2 as Y. intermedia. Two strains could be included in the latter species (biotypes 4 and 5 from Brenner et al. (14] but a confirmation by DNA hybridization would be useful. All the Y. enterocolitica and Y. frederiksenii were sero and lysotyped according to the Center for Yersinia (Paris, France).