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The plague: not just an historical curiosity.

The Gram-negative bacterium Yersina pestis is the causative agent of the infectious disease classically referred to as the plague. Wild rodents, especially ground squirrels and prairie dogs, are the natural reservoir of the organism. The organism can occasionally be transmitted to people who are bitten by an infected animal or infected fleas that feed on those animals. Currently, Y. pestis-infected rodents are present on every continent except Australia and Antarctica. Plague is endemic in animals inmany countries in Africa, the Americas and Asia and sporadic infections occur, at varying rates, in humans. In 2003, nine countries reported 2118 cases and 182 deaths from plague: 99% of those cases and deaths were reported from Africa.