Other changes under Prasad, who was also the agency's chief medical and science officer, included a new policy limiting the approval of COVID-19 vaccines.

Fear and uncertainty surround the Deferred Action for Childhood Arrivals (DACA) program, which was once seen as a lifeline for many immigrants, as federal actions threaten its stability.

President Donald Trump's administration is freezing $108 million in research funding to Duke University as the federal ...