Flashcard sets with a 'bubonic plague' term meaning 'a contagious disease that devastated the world in the 1300's, a pathogenic microbe that swept through europe during the middle agesand killed about 25 million people, 1/3 of the population. not until 500 years later in 1890 did microbiologists identify the causitive organism...bacterium called yersinia pestis which was carried by infected fleas that infected the rats, but when the rats became a rarity, the fleas infected the humans. characterized by buboes, fever.'

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