If diarrhea is present, cultures of stool should be examined for enteropathogens (i.e., Salmonella, Shigella, Campylobacter, and Yersinia).
Yersinia pestis, the first described species, was identified in 1894 by A.E.J. Yersin, a Swiss bacteriologist, and Kitasato ShibasaburÅ, a Japanese bacteriologist.
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Rodents are the natural reservoirs of Yersinia; less frequently, other mammals serve as the host.