So let's assume that it came from an ape (chimpanzee or gorilla) and was transmitted to a human, but this woman is not necessarily patient zero. Someone who was maybe poaching apes or just in their territory could be bitten, became infected, and there we have a new infection. Or some crazy person who deals in exotic animals got bitten. We're primates, apes are primates; and if diseases pass from non primates it is not far fetched that it can pass among an order such as primate with the similarities among apes and humans.
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