The strange reason flu shots have been so hard to improve

On August 5, 2025, the Department of Health and Human Services canceled 22 mRNA vaccine projects worth roughly $500 million and told the country it would stop investing in the technology that had brought us life-saving Covid vaccines. Health Secretary Robert F. Kennedy Jr., a longtime vaccine skeptic, claimed that the data showed these vaccines fail to protect against upper respiratory infections like Covid and flu. That his claims weren’t true — Moderna had already published Phase 3 trial…