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. 1985;26(1):13-20.
doi: 10.1186/BF03546560.

Enterotoxin production at 4, 22, and 37 degrees C by Yersinia enterocolitica and Yersinia enterocolitica-like bacteria isolated from porcine tonsils and pork products

T Nesbakken

Enterotoxin production at 4, 22, and 37 degrees C by Yersinia enterocolitica and Yersinia enterocolitica-like bacteria isolated from porcine tonsils and pork products

T Nesbakken. Acta Vet Scand. 1985.

Abstract
in English, Norwegian

Altogether, 71 strains of Yersinia enterocolitica and Yersinia enterocolitica-like bacteria from porcine tonsils and pork products were examined for their ability to produce enterotoxin using the infant mouse assay. Of these, 37 strains (52.1 %) produced enterotoxin at 22 °C, 3 were positive at 4 and 22 °C, and 1 was enterotoxigenic at 22 and 37°C. No strain was positive at all 3 temperatures. The highest prevalence of enterotoxin production at 22°C was detected in serotype 0:11 (80.0%), followed by 0:3/ biotype 4 (74.2 %), and 0:12 (66.7 %). Enterotoxin production at 4°C was recorded in 2 (15.4 %) of the Yersinia kristensenii strains (0:11, 0:12) and 1 of the Yersinia enterocolitica strains, (0:3) examined. One Yersinia kristensenii strain (0:11) was enterotoxigenic at 37 °C. The results indicate that enterotoxin production is a common feature of yersiniae isolated from porcine tonsils and pork products in Norway and may represent a possible source of food borne intoxication.

I alt ble 71 stammer av Yersinia enterocolitica og Yersinia enterocolitica-lignende bakterier undersøkt for enterotoksinproduksjon in vitro (infant mouse assay). Trettisju (52,1 %) av stammene produserte enterotoksin ved 22° C, og 3 av dem ved 4 og 22° C, mens 1 stamme var enterotoksinproduserende ved 22 og 37°C. Høyeste frekvens av enterotoksinproduserende stammer ved 22°C ble funnet innen serotype 0:11 (80,0%), etterfulgt av 0:3/biotype 4 (74,2%) og 0:12 (66,7%). Enterotoksinproduksjon ved 4°C ble funnet hos 2 av Yersinia kristensenii — stammene (0:11, 0:12) og 1 av Yersinia enterocolitica — stammene (0:3) som ble undersøkt. En Yersinia kristensenii — stamme (0:11) var positiv ved 37°C. Resultatene viser at enterotoksinproduksjon er svært vanlig hos Yersinia-bakterier isolert fra svinetonsiller og matvarer med svinekjøtt som vesentlig bestanddel i Norge.

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