title: Studies on the pathogenicity of Yersinia enterocolitica and Y. enterocolitica-like bacteria. 1. Enterotoxin production at 22 degrees C and 37 degrees C by environmental and human isolates from Scandinavia.
abstract: Altogether, 412 strains of Yersinia enterocolitica and Y. enterocolitica-like bacteria from environmental and human sources were examined for their ability to produce enterotoxin at 22 degrees C and 37 degrees C using the infant mouse assay. A total of 73 strains were positive at 22 degrees C, only. Another 28 strains were positive both at 22 degrees C and 37 degrees C. Of these 28 strains, 26 were sucrose and aesculin non-fermenting and all were Voges-Proskauer negative. All of these strains were isolated from non-human sources. All of 13 strains belonging to O-serogroup 28 produced enterotoxin at 37 degrees C. The results indicate that enterotoxin production at 22 degrees C is widespread in Y. enterocolitica with the highest prevalence among human clinical isolates. Enterotoxin production at both 22 degrees C and 37 degrees C seems to be common in Y. kristensenii (sucrose non-fermentors). Enterotoxin production is apparently rare in Y. frederiksenii (rhamnose fermentors) and in Y. intermedia (rhamnose and melibiose fermentors).
mesh_terms: D000818:Animals; D004768:Enterotoxins / Q000096:biosynthesis*; D005243:Feces / Q000382:microbiology; D005759:Gastroenteritis / Q000382:microbiology; D006801:Humans; D007422:Intestines / Q000382:microbiology; D012537:Scandinavian and Nordic Countries; D012703:Serotyping; D013696:Temperature; D015007:Yersinia / Q000145:classification / Q000378:metabolism / Q000472:pathogenicity*
chemical_list: D004768:Enterotoxins