Many scientists contend that HIV was most likely transmitted to humans from a type of

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The most widely accepted theory is that HIV was transmitted to humans from a type of chimpanzee known as the Pan troglodytes troglodytes, which carries a simian immunodeficiency virus (SIV) similar to HIV. The virus likely spread to humans when humans killed and ate infected chimpanzees or came into contact with their infected blood. There is no evidence to suggest HIV was transmitted from birds, mosquitoes, or rats.

Many Scientists Contend That HIV Was Most Likely Transmitted to Humans