Bubonic plague causes

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

The major forms of plague are caused by yersinia pestis living in rodents. The disease is then transferred to humans from the fleas that originally bit the infected rodent.

Causes

Plague is caused by the organism yersinia pestis. Rodents, such as rats, spread the disease to humans. People can get the plague when they are bitten by a flea that carries the plague bacteria from an infected rodent. In rare cases, you may get the disease when handling an infected animal. Certain forms of the plague can be spread from human to human. When someone with pneumonic plague coughs, microscopic droplets carrying the infection move through the air. Anyone who breathes in these particles may catch the disease. An epidemic may be started this way. In the middle ages, massive plague epidemics killed millions of people.

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