https://www.youtube.com/watch?v=JEYh5WACqEk https://www.youtube.com/watch?v=JEYh5WACqEk is a good watch here, if you're curious why Europeans didn't catch recip

https://www.youtube.com/watch?v=JEYh5WACqEk https://www.youtube.com/watch?v=JEYh5WACqEk is a good watch here, if you're curious why Europeans didn't catch reciprocal plagues when traveling to the Americas. Spoiler: it's what the adjacent comment said, the Americas didn't have the factors for plagues.