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.
Copyright © 2018-2020 BrainKart.com; All Rights Reserved. Developed by Therithal info, Chennai.