Plague is a zoonotic disease caused by the bacterium Yersinia pestis. Plague is found mainly in rodents, and is spread by fleas from rodent to rodent, as well as from rodents to other animals (including dogs) and humans, or accidentally from fleas to humans.   Plague is still present in parts of Africa, the Americas and Asia, and is considered a re-emerging disease with 1,000 to 5,000 human cases reported to the World Health Organization (WHO) each year.

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