Abstract
A membrane filter procedure was developed for the isolation of Yersinia enterocolitica from aquatic environments. Primary differentiation was based on the fermentation of sorbitol, the absence of lysine decarboxylase and arginine decarboxylase-dihydrolase activities, and the production of urease. Sodium deoxycholate was incorporated as an inhibitor of background organisms. The presumptive identification of Y. enterocolitica was accomplished in 50 h, and the rate of identity confirmation of typical colonies was 88%. The mean recovery rate of 15 strains from phosphate buffer suspensions was 91%, and quantitative recovery was demonstrated for low populations of the organism in both laboratory-prepared and naturally occurring mixed cultures. The technique was used to isolate 33 strains of Y. enterocolitica from 15 of 27 river water samples and from prechlorinated sewage effluent. Nine (27%) of the isolates were rhamnose positive, and only five (15%) were serotypable. Two isolates were identified as serotype O:4 (or O:4,32), two were O:17, and the fifth was O:40.
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Selected References
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