BACTERIUM, A microscopic organism that can cause disease; the plague was caused by Yersinia pestis., TRANSMISSION, The process of a disease moving from one host (like a flea) to another (a human)., RODENTS , Animals like rats that can carry fleas and diseases into human environments., INFECTIOUS, A word describing a disease that spreads very easily and quickly from person to person., SANITATION, A system for keeping places clean (like sewage and waste removal) to prevent disease., INCUBATION, The time it takes for symptoms to appear after a person is first infected., MORTALITY, The percentage or number of people who die from a specific disease., BUBOES, Painful, black, swollen lymph nodes that appear on the body of a plague victim., QUARANTINE, Forced isolation (originally 40 days) used to stop the spread of an outbreak..

Plague

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