system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:How did the European Colonials bring so much disease to Natives when they were quarantined on ships for months at a time?

I understand that the European colonists brought diseases that destroyed the native peoples who lived in the places that where colonized. But if the colonists were on ships for months at a time and were essentially quarantined, how were the diseases (besides STDS) still around by the time they landed?
gpt
Because those diseases were significantly more fatal to the natives who had never been exposed to them before.

For Europeans, small pox was a common disease, chances are many many of your ancestors had it, and over generations Europeans built up a resiliency to small pox. 

Then, they expose someone who’s ancestors didn’t experience it and therefore didn’t have the same resiliency, and the disease was significantly more deadly.