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Unformatted text preview: person. This form is characterized by a shorter incubation period and greater mortality (90%). Pathogenic Y. pestis produce two antiphagocytic components; F1 antigen and the VW antigens. Both are required for virulence and, interestingly, are only produced when the organism grows at 37, not at lower temperatures. This might explain why the bacteria are not virulent in their alternate host, the flea, which has a body temperature near 25. Moreover, the bacteria are capable of surviving and multiplying within monocytes, but not PMNs, and upon emerging from the monocytic host, the bacteria possess their F1 and VW antigens. Most disease produced by Y. enterocolitica is a typical gastroenteritis characterized by fever, abdominal pain , and diarrhea. Illness generally lasts from 1 to 2 weeks but chronic cases may persist for up to a year....
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