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The answer is the bubonic plague. 

Answer: The bubonic plague is a deadly, very contagious disease carried by fleas and rats.

Explanation:

Hi.

The bubonic plague is a deadly, very contagious disease carried by fleas and rats.

The bubonic plague, also known as the “The Black Death,” has existed for thousands of years. The first recorded case of the plague was in China in 224 B.C.E. But the most significant outbreak was in Europe in the mid-fourteenth century. Over a five-year period from 1347 to 1352, 25 million people died.

Plague infects both people and rodents, with rodents helping to transmit it further within the population. Fleas feeding on infected rodents can transmit the disease to people as well. Once infected, people can infect others by coughing, sneezing, or close talking.