Many scientists at the federal health agencies await the second Donald Trump administration with dread as well as uncertainty over how the president-elect will reconcile starkly different philosophies among the leaders of his team.

Vaccines are most effective at scale when enough people get them to provide "herd immunity" from a virus, doctors and officials say.

The anti-vaccine activist could oversee the Centers for Disease Control and Prevention, the Food and Drug Administration and the National Institutes of Health.

Donald Trump wants Robert F. Kennedy Jr. to be his health and human services secretary. But Kennedy has spread misinformation about vaccines, fluoride, raw milk and other health topics. Here's what he has said.

One compares Kennedy being considered to “having somebody who doesn’t believe in gravity being the head of NASA.”