Answer:
Bubonic plague is a deadly infectious disease commonly spread by Rats.
Explanation:
The bubonic plague originated from Rats. Rats have been blamed for spreading the Black Death in Europe killing 25 million people. (third of the continent's population) But I'm pretty sure it's the fleas on rats that caused the bubonic plague. It was believed that it started in China in 1334 and spread because of trade routes and reaching Europe.
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