The United States has formally notified the United Nations that it is withdrawing from the World Health Organization, following through on an announcement President Trump made in late May. The move, however, would not be effective until July 6, 2021, officials said — leaving open the possibility that, should Trump lose reelection, a Biden administration could reverse the decision. The former vice president promptly indicated he would do so. … The withdrawal of the United States would plunge global health governance into the unknown, creating questions about the economic viability of the WHO, the future of the polio eradication program, the system for reporting dangerous infectious disease outbreaks, and myriad other programs that are as pertinent to the health of Americans as they are to people from countries around the world, such as efforts to combat the spread of antibiotic-resistant bacteria.