A new strain of HIV has been identified in an African woman and researchers say it appears to be the first to be transmitted to humans from gorillas instead of chimpanzees.
The 62-year-old woman comes from the West African nation of Cameroon and now lives in Paris.
According to reports, she has no symptoms of AIDS.
The new strain, known as HIV-1, group P, differs from the three earlier identified strains because it can’t be detected by usual laboratory tests.
Previously documented cases of HIV-1 are thought to have come from chimpanzees. This new strain is closely related to a virus known as SIVgor, or simian immunodeficiency virus-gorilla.