U.S. Terminates Funding for Polio, H.I.V., Malaria and Nutrition Programs Around the World

Here are some of the 5,800 contracts the Trump administration formally canceled this week in a wave of terse emails.

F.D.A. Cancels Meeting of Vaccine Experts Scheduled to Advise on Flu Shots

The cancellation plays into fears among scientists who worry that Robert F. Kennedy Jr. will use his position as health secretary to sow doubts about vaccines.

Kennedy Says ‘Nothing’ Off Limits in Scrutinizing Chronic Disease

Robert F. Kennedy Jr., laying out his early health agenda, said he would examine childhood vaccines, psychiatric drugs and other “formerly taboo” topics in investigating the causes of chronic disease.

Trump Moves Toward Pushing Openly Transgender People Out of Military

The president also ordered the Pentagon to end diversity programs, reinstate many service members dismissed for refusing the coronavirus vaccine and create a new missile defense system.

Health Secretary Defends Biden’s Covid Vaccine Mandates and Social Media Efforts

In a wide-ranging interview, Xavier Becerra, President Biden’s health secretary, defended his tenure and hinted that he might run for governor of California.

RFK Jr. Sought to Stop Covid Vaccinations 6 Months After Rollout

Robert F. Kennedy Jr. petitioned the F.D.A. to revoke authorization of the shots at a time when they were in high demand and considered life-saving.