Describe the theories of origin of HIV/AIDS.

The origin of HIV/AIDS has been a subject of scientific investigation and debate. Two main theories have emerged to explain the origins of the virus: the zoonotic transmission theory and the OPV (oral polio vaccine) theory.

1. Zoonotic Transmission Theory:
   According to this theory, HIV/AIDS originated from a zoonotic transmission, where the virus jumped from non-human primates __________ ______ __________ ___ ________ ___ ___ _________ ______ _____ ______ __________.
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