MAPUTO, MOZAMBIQUE | Maputo's streets were buzzing with commercial activity Monday and its beaches packed over the weekend with families having picnics and friends sharing beers. But just last month, there was a very different scene here: riots over…

The recent discovery that U.S. researchers intentionally infected Guatemalans with STDs in the 1940s spurred angry responses and an apology from President Obama to Guatemala's President Alvaro Colom. Now the directors of the CDC and the National Institutes of…