Bubonic plague Bubonic plague is a zoonotic disease, circulating mainly in fleas on small rodents, and is one of three types of bacterial infections caused by Yersinia pestis (formerly known as Pasteurella pestis), that belongs to the family Enterobacteriaceae. Without treatment, the bubonic plague kills about two thirds of infected humans within four days. The term bubonic plague is derived from the Greek word βουβών, meaning "groin". Swollen lymph nodes (buboes) especially occur in the armpit and groin in persons suffering...

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