Add Yahoo as a preferred source to see more of our stories on Google. Patrick Arbuthnot was browsing his emails on what seemed like a normal workday in his lab in Johannesburg when he saw a strange ...

FILE - A pharmacist holds a vial of lenacapavir, an injectable HIV prevention drug, at the Desmond Tutu Health Foundation's Masiphumelele Research Site, in Cape Town, South Africa, July 23, 2024. (AP ...