The Georgia-based U.S. Centers for Disease Control and Prevention (CDC) recently reported the seasonal influenza vaccines selected for the 2021-2022 flu season were suboptimal at reducing outpatient respiratory illnesses caused by influenza A(H3N2) viruses.
The CDC’s Morbidity and Mortality Weekly Report (MMWR) found the overall vaccine effectiveness (VE) against medically attended outpatient acute respiratory infection (ARI) associated with influenza A(H3N2) virus was 16% (95% CI = −16% to 39%), which was considered not statistically significant.
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