Clues to resistance. 1,100 Words on Duke Research. February 5, 2019. In 2000, 23-year-old Gimble from Gombe National Park — made famous by Jane Goodall — became the first wild chimpanzee to test positive for simian immunodeficiency virus (SIV), the primate precursor to HIV. Now, he and hundreds of other wild chimpanzees across sub-Saharan Africa are helping researchers understand what makes some chimps more resistant to infection.