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That's as good an explanation as I've ever heard and I'm sure it has at least a small amount to do with it. I think, with coming in contact with more hosts, the viruses have more chances to mutate.
I just find it strange that there wasn't some super-disease that killed off Europeans. I mean, it seems like there are tons of fatal viruses coming out of Africa in places where the population density doesn't seem so high. You'd think there'd have been something from the Amazon at the very least...
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