The Black Death

Has 75 Million Deaths or More

Cause, Brief history, and Summary

The cause of The Black Death is thought to have originated in Central Asia, where it was most likely came from oriental rat fleas living on the black rats that were on merchant ships that came to Europe. The plague reduced the world population from about 450 million down to 350–375 million in the 14th century. The world population as a whole didn't recover to pre-plague levels until the 17th century. The plague recurred occasionally in Europe until the 19th century. The plague created a series of religious, social, and economic upheavals, which had profound effects on the course of European history.

How it's Transmitted, Risk Groups, Infectious Period, and Status

The plague disease is caused by yersinia pestis, an enzootic, commonly present in populations of fleas carried by ground rodents in various areas including Central Asia, Kurdistan, Western Asia, Northern India and Uganda. It's transmitted through being around or interacting with anything that has yersinia pestis and what it has touched/interacted with. In Europe, it's infectious period was during the years 1346–1353, during that time 75 - 200 million people died. It's not as risky as it was back then, but it's not fully gone.