The director of the US Centers for Disease Control and Prevention (CDC), Susan Monarez, has been ousted from her role as head of the public health agency, a source familiar with the matter told the BBC's US partner CBS News.
It comes less than a month after she was confirmed by the Senate. It is unclear why she was removed from the job.
The US Department of Health and Human Services (HHS) confirmed her departure in a post on X, thanking her "for her dedicated service to the American people."
Ms Monarez, a long time federal government scientist, was nominated by President Donald Trump to lead the CDC and was confirmed in a Senate vote in July.
Her nomination came after Trump withdrew his first pick, former Republican congressman Dave Weldon, who had come under fire for his views on vaccines and autism.
