Plague is a bacterial infection found mainly in rodents and their fleas. But via those fleas it can sometimes leap to humans. When it does, the outcome can be horrific, making plague outbreaks the most notorious disease episodes in history.
The map show clearly the spreading wave of Black Death(caused by bubonic plague) across Europe (1347-1351) as people panicked & fled to avoid the pestilence. There is also some evidence that these people, by fleeing to avoid the illnes s, actually helped to spread it faster and further.
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