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, bacteria and other microbes typically coexist with their hosts without causing huge problems, but every now and then one will mutate and become more virulent. The most susceptible will get sick and often die while the resistant pass that trait along to their offspring who over time become increasingly resistant until the disease is no longer particularly dangerous. Then it mutates again and the whole process starts over.
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