Where viruses or diseases that you get from other people come from? Like how does the first person end up with it?
In: Biology
Viruses also evolve and can sometimes jump between species. HIV seems to have evolved from SIV in monkees, and new kinds of influenza can apparently start in pigs and jump to humans who live in close contact.
P.S. From what I’ve read, interspecies infection can start slowly with little ability to infect, and gradually adapt to the new species.
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