) is rod shaped, Gram-negative, and non-motile but has two distinct flagellar gene clusters; one set is incomplete and the other produces a truncated protein, which acts as a transcriptional activator for the flagellar genes. Y. pestis
, a Group-A bioterrorism agent, causes Plague, a re-emerging zoonotic disease transmitted to humans through flea bites and typically characterized by the appearance of a tender and swollen lymph node, the bubo. It is believed that Y. pestis
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Emerg. Infect. Dis. 2005 Aug;11(8):1317-8; author reply 1318-9.
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