Prasad Defends Vaccine Policy Shift: Report

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CBER director Vinay Prasad addressed a 12/4 closed-door investor conference in New York and defended his leadership and attributed criticism to "misleading media narratives," according to a report by STAT News. His appearance comes the day after 12 former FDA commissioners issued an extraordinary public warning, arguing that sweeping internal directives proposed by Prasad would undermine evidence-based vaccine regulation and threaten public health. In a New England Journal of Medicine Perspective, the former officials said a memo circulated last week by Prasad represents a radical break from long-standing scientific standards that guide vaccine development and evaluation.

CBER has faced significant controversy and plummeting morale under Prasad’s leadership. He defended his new regulatory plan that would require vaccine makers to conduct larger and longer studies before updating vaccines, according to STAT. Prasad said this is part of “modernizing” how FDA approves and updates vaccines, not a recklessly broad rollback of protections. Prasad also reportedly pushed back on the notion that FDA under his leadership is micromanaging “every single thing” — a criticism he said he has seen in the media. “I read in the newspaper I’m both micromanaging... and I’m never there,” he said.

His controversial approach to vaccine regulation and internal clashes with other FDA officials have led to turmoil that has worried investors in the biotech sector and other stakeholders. Under Prasad’s leadership, the agency appears to be moving toward stricter and more conservative regulatory practices, which could dramatically reshape the vaccine and biologics landscape.

So far, for manufacturers and drug developers, the message seems clear: expect longer, more rigorous trials — and possibly less flexibility. Regarding public health concerns, critics worry that the changes could slow the rollout of critical vaccines, especially updates tailored for emerging infectious threats.

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