Plague
Plague is an infectious, deadly disease caused by the bacterium Yersinia pestis. Plague pandemics (outbreaks of disease over a wide geographic area and affecting a large number of people) have wiped out populations since A.D. 542. Today, plague is sometimes seen in parts of the western United States and remains present in certain regions of the world including South America, Mexico, and parts of Asia and Africa.
Transmission of plague
Plague is normally transmitted to humans by the bite of a flea that has ingested blood from an infected rodent, such as a rat, squirrel, or prairie dog. Transmission from person...
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