NAIROBI — The novel coronavirus is racing toward a collision with two longer-running pandemics, as waves of HIV and tuberculosis infections have left tens of millions of people in the developing world particularly vulnerable to the new threat.
The regions hit hardest by HIV and tuberculosis are in Africa and South Asia, where the coronavirus is spreading rapidly. The countries most at risk include South Africa, home to the world’s largest number of HIV-positive people, and India, which has the highest number of tuberculosis cases in the world.