The increasing prevalence of new coronavirus variants is raising questions about how well protected those who’ve already had their COVID-19 shots are against evolving forms of the SARS-CoV-2 virus. Here, microbiology and infectious disease specialist William Petri of the University of Virginia answe

Margaret Heckler was President Reagan's secretary of health and human services from March 1983 to December 1985. Here she says AIDS was her number one priority, but that she had to balance her department's response against the Reagan administration's fiscal priorities. Heckler maintains that preexis...