
Acting CDC Chief Delays Publication of Vaccine-Effectiveness Study
The CDC's acting director, Dr. Jay Bhattacharya, reportedly postponed releasing an MMWR study showing that 2025–26 Covid vaccines may reduce severe illness, citing concerns about the observational test-negative design; the move has sparked debate about political interference in vaccine research, though officials say it's routine to review methodology and that publication delays are sometimes necessary to ensure analyses are sound.











