Where viruses or diseases that you get from other people come from? Like how does the first person end up with it?

Question

Where viruses or diseases that you get from other people come from? Like how does the first person end up with it?

In: Biology

Answer 1

Viruses and other infectious diseases have evolved alongside life from the beginning. The first human to catch a disease was the first human, whatever descended from an arbitrarily defined proto-human.