Zackie Achmat, once at the center of South Africa’s push for lifesaving H.I.V. treatment, has come out of retirement as U.S. funding cuts and his own government’s inertia revive old fears. Global ...

“It’s heartbreaking,” says Velontafa Jackia, a doctor based in Sambava, in the north-east of Madagascar. Until this year she was part of a project funded by the United States Agency for International ...