YERSINIA
BACTERIOLOGY
Morphologically, Yersinia
tends to be coccobacillary and to retain staining at the ends of the cells
(bipolar staining). In general, growth and metabolic characteristics are the
same as those of other Enterobacteriaceae,
although some strains grow more slowly or have optimal growth temperatures
below 37°C. The genus includes 11 species, of which Yersinia pestis,Yersinia pseudotuberculosis, and Yersiniaenterocolitica are the important
pathogens for humans. Yersinia pestis
is antigenically homogenous, butY.
pseudotuberculosis and Y.
enterocolitica havemultipleO andH antigens. Yersinia are primarily animal pathogens, with occasional
transmission to humans through direct or indirect contact. Y. pestis, the cause of plague, although features of its pathogenesis
common to other Yersinia are included
in this discussion.
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