Jay Bhattacharya, a top Trump administration health official and an outspoken critic of the Centers for Disease Control and Prevention’s response to the coronavirus pandemic, will lead the CDC on an acting basis, according to four people who spoke on the condition of anonymity to describe personnel moves.
Bhattacharya, who will continue his role as director of the National Institutes of Health, replaces Jim O’Neill, who had served as the CDC’s acting director. O’Neill, who had also served as the deputy secretary of the Department of Health and Human Services, will be nominated to run the National Science Foundation after he declined a potential ambassadorship to the Organization for Economic Cooperation and Development, two of the people said.
The installation of Bhattacharya at the CDC is the latest move by the White House and Health Secretary Robert F. Kennedy Jr. to shake up HHS’s leadership team ahead of the midterms, as the Trump administration seeks to stabilize a department rattled by internal fights and controversial messages.
The New York Times first reported that Bhattacharya would serve as the acting head of CDC, which is charged with protecting Americans from health threats and issues recommendations on vaccines and other public health matters. Trump officials have said they are planning to find a full-time CDC director, a post that requires Senate confirmation. Susan Monarez, who was confirmed as CDC director in July, was ousted less than a month later after clashing with Kennedy over his plans to change vaccine policies.
Bhattacharya, a Stanford University physician and economist, rose to prominence during the pandemic by arguing that the government’s response to the outbreak was too harsh, a stance that put him at odds with public health leaders who said his proposals would imperil the most vulnerable Americans. He co-wrote the Great Barrington Declaration, which was published in October 2020 and called for an end to coronavirus shutdowns. The declaration drew rebukes from government officials — a clash that ultimately boosted his profile and helped draw the support of Kennedy, a fellow critic of the government’s pandemic response.
“The CDC peddled pseudo science in the middle of a pandemic,” Bhattacharya wrote on X in 2024, criticizing agency leaders’ past claim that widespread masking could end the coronavirus outbreak.
As CDC’s acting head, Bhattacharya is poised to oversee the agency’s vaccine recommendations, which have emerged as a political flash point as Kennedy has worked to roll them back over the objections of public health leaders. A KFF poll published this month found that 47 percent of U.S. adults now trust CDC for reliable information on vaccines, down from 85 percent in early 2020.
Bhattacharya has said he supports vaccination for childhood diseases.
“I think the best way to address the measles epidemic in this country is by vaccinating your children for measles,” Bhattacharya said at a Senate hearing this month.
Bhattacharya and other NIH leaders in January also published a commentary in the journal Nature Medicine that criticized the public health response to the pandemic led by other agencies.
“Many of the recommended policies, including lockdowns, social distancing, school closures, masking, and vaccine mandates, lacked robust confirmatory evidence and remain the subject of debate regarding their overall benefits and unintended consequences,” they wrote. “Where enforced, vaccine mandates contributed to decreased public confidence in routine voluntary immunizations.”
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