Yersinia pestis<unk>  is an infectious disease among rodent species that live in close association with humans in<unk>  areas. It is caused by the bacterium Yersinia pestis which is the same bacterium that causes bubonic and pneumonic plague in humans. Plague was first introduced into the United States in 1900 by rat–infested steamships that had sailed from affected areas, mostly from Asia.<unk>  spread from<unk>  rats to rural rodent species, especially among prairie dogs in the western United States.
Urban plague
Hittite plague
Sylvatic plague
Bubonic plague
Virgin soil epidemic
Cholera belt
Flying squirrel typhus
Epidemic typhus