“We will currently maintain those patients on the treatment,” Mr. Sastry said. He did not explain how that would happen if funding dropped by roughly 20 percent, but the programs have wide bipartisan support on Capitol Hill, where they may be shielded from the proposed cuts.
Much of the success of anti-AIDS efforts in Africa has come from a guarantee in many countries that people who test positive for H.I.V. can immediately receive treatment.
With a huge share of Africa’s population reaching sexual maturity in the next four years, the virus could again imperil much of the continent if fewer people are treated, said Brian Honermann, deputy director at amfAR, a foundation that invests in AIDS research.