[Yersinia enterocolitica infections in the Zurich area. Bacteriologic-serological diagnosis and case reports].

It has been investigated whether in the region of Zurich there are infections caused by Yersinia enterocolitica, and, if so, whether these could readily be diagnosed by us. Both questions can be answered in the affirmative. Yersinia enterocolitica type 3 was identified in 5 of the 837 stool specimens sent to our Salmonella diagnosis unit. In 19 of the 1125 blood serum specimens the titer of agglutinin against Yersinia enterocolitica type 3 was higher than 1 : 160. Our methods of isolation and identification of Yersinia enterocolitica are described. The clinical findings were in accordance with previously published observations by different authors. In none of the cases could any other causal agent have been responsible for the symptoms.