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The origin of HIV/AIDS has been the subject of many scientific studies as well as several controversial theories. While scientific evidence strongly supports the view that the Human Immunodeficiency Virus (HIV) originated from simian immunodeficiency viruses (SIV) in non-human primates and crossed into humans, a number of controversial theories have also emerged over the years. These theories have attracted public attention but lack credible scientific evidence. Two of the most well-known controversial theories are the Oral Polio Vaccine (OPV) theory and the _________ ___ ___ ______ ____ __________ _________ ____ __________ __________.
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