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Government-sponsored vaccine updates have waned in frequency, prompting epidemiologists from around the U.S. to collaborate on detailed reviews of the newest safety and efficacy data. The latest focus on influenza, Covid-19, and respiratory syncytial virus (RSV) vaccination.
Last year’s flu vaccine formulation was about 30% effective against flu-related hospitalization among adults, including those ≥65 years of age. Vaccination was also 30% to 70% effective against mortality in older adults, based on 2024–25 data.
Vaccination during any trimester of pregnancy almost halved the risk of laboratory-confirmed influenza among infants ≤6 months of age.
No new safety concerns have arisen, even when the vaccine i…