Mother-to-child H.I.V. transmission takes an enormous toll in low-income countries. The Trump administration has laid off the officials who worked to solve the problem.
President Trump’s pause on aid, and the gutting of the primary aid agency, could jeopardize the health of more than 20 million people worldwide, including 500,000 children, experts say.
The epidemic is concentrated in the Democratic Republic of Congo, but the virus has now appeared in a dozen other African countries.