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Yersinia pestis (YP), the gram-negative plague bacterium, has shaped human history unlike any other pathogen known to mankind. YP (transmitted by the bite of an infected flea) diverged only recently from the related enteric pathogen Yersinia pseudotuberculosis but causes radically different diseases. Three forms of plague exist in humans: bubonic (swollen lymph nodes or bubos), septicemic (spread...
Plague is an acute, severe, zoonotic infection caused by the Gram-negative bacillus Yersinia pestis, a member of the Enterobacteriaceae family. It manifests as a severe, febrile illness associated with lymphadenitis and suppuration (bubonic plague) or necrotizing pneumonitis (pneumonic plague). It has been recorded since biblical times and has generally affected humans in explosive epidemics, causing...
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