At a glance
Flu Vaccination Coverage for Children and Adults
Influenza (flu) vaccination coverage for children and adults is assessed through U.S. jurisdictions' Immunization Information Systems Resources (IIS) data, submitted from jurisdictions to CDC monthly, in aggregate, by age group.
Monthly estimates shown are cumulative, reflecting all persons vaccinated from July 1 through a given month of that flu season.*,† Cumulative estimates include any historical data reported since the previous submission. National estimates are not presented since not all U.S. jurisdictions are currently reporting their IIS data to CDC. Jurisdictions reporting data to CDC include U.S. states, some localities, and territories.
- Figure 5A. Monthly Cumulative Number and Percent of Children 6 Months–17 Years Who Received 1+ Influenza Vaccination Doses‡,§, by Season, Age Group, and Jurisdiction, United States. Data Source: Jurisdictional Immunization Information Systems (IIS).
- Figure 5B. Monthly Cumulative Number and Percent of Children 6 Months–17 Years Who Received 1+ Influenza Vaccination Doses and Comparison between 2025─26 and Three Previous Seasons‡,§, by Age Group and Jurisdiction, United States. Data Source: Jurisdictional Immunization Information Systems (IIS).
- Figure 5C. Monthly Cumulative Number and Percent of Adults 18 Years and Older Who Received 1+ Influenza Vaccination Doses‡,§, by Season, Age Group, and Jurisdiction, United States. Data Source: Jurisdictional Immunization Information Systems (IIS).
- Figure 5D. Monthly Cumulative Number and Percent of Adults 18 Years and Older Who Received 1+ Influenza Vaccination Doses and Comparison between 2025─26 and Three Previous Seasons‡,§, by Age Group and Jurisdiction, United States. Data Source: Jurisdictional Immunization Information Systems (IIS).
Download Data for Figures 5A & 5C
Download Data for Figures 5B & 5D
Note: Because IIS data are intended to capture all vaccinations administered within a jurisdiction rather than a sample, standard errors are not calculated and statistical testing for differences in estimates across years are not performed. Quality and completeness of data may vary across jurisdictions. Laws and policies regarding the submission of vaccination data to an IIS vary by state, which may impact the completeness of vaccination coverage reflected for a jurisdiction.
Coverage estimates based on IIS data are expected to differ from National Immunization Survey-Flu (NIS-Flu) estimates for children and National Immunization Survey-Fall Respiratory Virus Module (NIS-FRVM) for adults. NIS-Flu and NIS-FRVM estimates are based on a sample that may not be representative after survey weighting and vaccination status is determined by survey respondent rather than vaccine records or administrations. In general, NIS-Flu and NIS-FRVM estimates tend to overestimate coverage due to overreporting and IIS estimates may underestimate coverage due to incompleteness of data in certain jurisdictions. IIS coverage estimates reported on jurisdictions' dashboards may use different criteria for numerators and denominators (e.g. jurisdictions may use IIS-based denominator instead of census population) and thus may differ from those reported on CDC's Weekly Flu Vaccination dashboard.
*Estimates include persons who are deceased but received a vaccination during the current season. People receiving doses are attributed to the jurisdiction in which the person resides unless noted otherwise.
†Influenza vaccination coverage denominators for states and localities are obtained from the previous year's U.S. Census Bureau population estimates (e.g., 2025–26 season influenza coverage estimates use population denominators from the 2024 U.S. Census). Note that in archived versions of dashboards from previous seasons, 2020 U.S. Census estimates were used as denominators for all seasons. Denominators for U.S. territories and freely associated states, including American Samoa, Guam, Marshall Islands, Micronesia, Northern Mariana Islands, Palau, and U.S. Virgin Islands are obtained from: https://www.census.gov/programs-surveys/international-programs/about/idb.html.
‡Some jurisdictions' data are not displayed if they were not available by data retrieval timelines. Data displayed include both valid and invalid doses, persons with last known addresses in the jurisdiction, and persons with unknown addresses within the jurisdiction. Data excludes people whom a provider has indicated have left the jurisdiction. A period in time assessment is used to calculate influenza vaccination coverage which requires all individuals to be at least 6 months old by October 1, 2024. Number of doses administered and coverage estimates for a given month may change over time for some jurisdictions. New York City (New York) and Philadelphia (Pennsylvania) report data separately from their respective states. New York state data exclude New York City and Pennsylvania state data exclude Philadelphia County. Chicago is a funded jurisdiction; however, their data are reported with Illinois due to lack of a comparable denominator to calculate coverage.
§Figures 5A and 5C (line graphs) will not display any lines for jurisdictions whose data have not been submitted to CDC; these jurisdictions appear gray in Figures 5B and 5D. Some Pacific Island jurisdictions' vaccination programs may be aligned to regional virus circulation patterns (i.e., they may vaccinate on a different schedule than the continental U.S.).