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==history==
*Justinian plague
**possibly from Africa
*Black death
**from Asia
*19th century pandemic
**from China through Hong Kong
==pathogen==
*''Yersinia pestis''
*gram negative bacili ("cocco-bacilli")
*sylvatic plague
**wide range of wild rodents, rabbits, squirrels, etc.
*urban plague
**black rat ''Rattus rattus''
==epidemiology==
==clinical features==
*"bubo" - prominent lymphadenopathy
**very much painful
*incubation 2-7 days after flea bites or close contact to contaminated animal secrete
*bubonic plague
*septicemic plague
**meningitis may occur
*pneumonic plague
==diagnosis==
