Botswana slashed new pediatric HIV infections by over 98 percent through widespread antiretroviral treatment, comprehensive testing, and sustained health care investments. | Per-Anders Pettersson/Getty Images Botswana has been getting a lot of calls lately from across the African continent, prodding the nation — once “at risk of extinction” from HIV — to tell the world how they did the impossible: squash childhood HIV rates.  The number of children living with HIV has declined sharply everywhere, but nowhere more so than in Botswana, which has managed to slash its childhood infection...

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