During the 2021-2022 influenza season, vaccination significantly reduced outpatient visits, consistent with prior seasons during which A(H3N2) viruses were predominant, especially among younger patients, recent study data showed.
“CDC estimates influenza vaccine effectiveness annually and has published estimates most seasons since 2004-05,” Jessie R. Chung, MPH, CDC epidemiologist in the Influenza Division, told Healio. “Estimates were not available in the 2020-21 influenza season due to historically low levels of influenza circulation.”
To assess estimates from the most