Columbus brought measles to the New World. It was a disaster for Native Americans.

In 1492, Columbus sailed the ocean blue, bringing to the New World a bounty of wonder: coffee, horses, turnips, grapes, wine.

But Columbus and his fellow explorers, in addition to importing crops and animals we now take for granted, were also the Typhoid Marys of their time.

https://www.washingtonpost.com/history/2019/05/05/columbus-brought-measles-new-world-it-was-disaster-native-americans/?noredirect=on&utm_term=.39b651d8244c