CDC updated its estimates of the numbers of flu illnesses, hospitalizations and deaths prevented as a result of vaccination during the 2022-2023 flu season. Flu vaccination prevented 6 million flu-related illnesses, 2.9 million medical visits, 65,000 hospitalizations, and 3,700 deaths, according to recently updated estimates. Estimates for the 2019-2020 and 2021-2022 flu seasons were also updated.