>Hard to catch a disease when it’s always the same 15 people around you, with no communication to the outside world.
There’s plenty of bacteria hanging out in the dirt, water, the animals you eat, and on your own skin. Add in the parasites, and zoonotic viruses and it’s not very hard at all to catch a disease even as a solitary hermit in the wild.
>factory farms
Didn’t need factory farms for smallpox. Many animals live in large herds, which were larger in the past. If you read accounts from the 18th and early 19th century there are many reports of squirrel migrations involving hundreds of millions of squirrels in relatively small areas.
There’s plenty of bacteria hanging out in the dirt, water, the animals you eat, and on your own skin. Add in the parasites, and zoonotic viruses and it’s not very hard at all to catch a disease even as a solitary hermit in the wild.
>factory farms
Didn’t need factory farms for smallpox. Many animals live in large herds, which were larger in the past. If you read accounts from the 18th and early 19th century there are many reports of squirrel migrations involving hundreds of millions of squirrels in relatively small areas.