What is already known about this topic?
Annual vaccination against seasonal influenza is recommended for all persons in the United States aged ≥6 months. Effectiveness of seasonal influenza vaccine varies by influenza season.
What is added by this report?
Based on data from 3,636 children, adolescents, and adults with acute respiratory infection during October 4, 2021–February 12, 2022, seasonal influenza vaccination did not reduce the risk for outpatient respiratory illness caused by influenza A(H3N2) viruses that have predominated so far this season.
What are the implications for public health practice?
CDC recommends influenza vaccination for as long as influenza viruses are circulating. Vaccination can prevent serious influenza-related complications caused by viruses that might circulate later in the season, including 2009 pandemic A(H1N1) and influenza B viruses.
Entire content available on: https://www.cdc.gov/mmwr/volumes/71/wr/mm7110a1.htm
