A week after Donald J. Trump was inaugurated, a senior scientist at the National Institutes…

Robert F. Kennedy Jr., the nation’s health secretary, on Saturday instructed leaders of the nonprofit…

Joan Presky worries about dementia. Her mother lived with Alzheimer’s disease for 14 years, the…

As containment efforts falter, the measles outbreak in West Texas is likely to persist for…

Kilmer S. McCully, a pathologist at Harvard Medical School in the 1960s and ’70s whose…

The Food and Drug Administration said on Thursday that it would delay by 30 months…