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Yersinia

A group of gram-negative bacteria responsible for bubonic plague (characterized by enlarged lymph nodes [bubo]), gastroenteritis, etc. in rodents and humans acquired through fleabites. Generally, but not always, infectiveness of the flea carriers may be blocked during the early stages of the incubation period (Eisen RJ et al 2006 Proc Natl Acad Sci USA 103:15380). The sequenced genome of Y. pestis includes a 4.65 Mb chromosome and three plasmids of 96.2, 70.3 and 9.6 kb. It contains 150 pseudogenes. The genome shows frequent insertion sequences and intragenic recombinations. The bacteria secrete the Yop protein that targets primarily dendritic cells, macrophages and neutrophils of the immune system but rarely the B and T lymphocytes (Marketon MM et al 2005 Science 309:1739). YopJ acetylates and inhibits MAPK kinase activation and inhibits NF-κB signaling,