Enterocolitica Biotype Research Articles

Prevalence of raised Yersinia enterocolitica antibody titre in unselected, adult populations in Denmark during 12 years.

Yersinia enterocolitica biotype 4, serotype 0:3 is by far the most common human pathogenic Yersinia enterocolitica subtype in Scandinavia. It is extraordinarily immunologically specific, and an elevated antibody titre greater than or equal 80-160 is known to indicate acute infection. This titre was measured in five population surveys conducted in 1967-78, including 3278 examined adult men and women. The prevalence of titre elevation greater than or equal to was 1.0% in 1967. In 1978 it was significantly higher, 7.7%, and also the individual course of the titre in a ten-year longitudinal survey showed a significant increase in this prevalence, indicating an increasing incidence of infection. Significant sex and age differences were seen, women and younger subjects being more frequently affected than men and older subjects. The prevalence of elevated titre showed a seasonal variation with a maximum in the spring and autumn.

Repeated isolation of Yersinia enterocolitica from pasteurized milk in a holding vat at a dairy factory.

Yersinia enterocolitica biotype 1 serotype 5a was repeatedly isolated from pasteurized milk in the same holding vat at a particular dairy factory. It is considered that the occurrence of this organism in pasteurized milk may be partially attributed to its ability to multiply at refrigeration temperatures and survive in inadequately ‘disinfected’ vats.

Isolation of Yersinia enterocolitica from Milk and a Dairy Farm in Australia

Forty‐eight isolates obtained from pasteurized milk and cream, raw milk, and various sites on a dairy farm were identified as Yersinia enterocolitica biotype 1 but were unusual in their ability to ferment lactose. The majority belonged to serotype 5a. Serotypes 5b, 6, 13/15 and 23/15 were also found. A few isolates were not typable. There is no evidence that strains isolated in this study are pathogenic for humans. Their presence in pasteurized products and growth at refrigeration temperatures are, however, cause for concern.

Biochemical, serological, and phage typing characteristics of 459Yersinia strains isolated from a terrestrial ecosystem

The origins of human contamination withYersinia enterocolitica are still unknown. We have investigated the major components of a terrestrial ecosystem (soil, earthworms, field voles, shrews, crops, hares, rabbits, and birds) for the presence ofYersinia. Four hundred fifty-nine strains ofYersinia were isolated. We report the first isolations of typicalY. enterocolitica belonging to classical or new biotypes and ofY. enterocolitica-like organisms (sucrose negative; rhamnose positive; melibiose and rhamnose positive) from soil samples, earthworms, crops, and birds. Sucrose-negativeY. enterocolitica strains and biotypes 1, 2, and 3, usually associated with human nonmesenteric syndromes, are predominant in soil, which can be considered as a reservoir for these biotypes.Y. enterocolitica serogroups O∶3 and O∶9, strains of which are responsible in Europe for human mesenteric syndromes, were not found in this study. The epidemiology ofY. enterocolitica infections is discussed.