Monthly Cumulative Number and Percent of Persons Who Received ≥1 Influenza Vaccination Doses, by Flu Season, Age Group, and Jurisdiction

Monthly Cumulative Number and Percent of Persons Who Received ≥1 Influenza Vaccination Doses, by Flu Season, Age Group, and Jurisdiction

• Influenza vaccination coverage for children and adults is assessed through U.S. jurisdictions’ Immunization Information Systems (IIS) data, submitted from jurisdictions to CDC monthly in aggregate by age group. More information about the IIS can be found at https://www.cdc.gov/vaccines/programs/iis/about.html.

• Influenza vaccination coverage estimate numerators include the number of people receiving at least one dose of influenza vaccine in a given flu season, based on information that state, territorial, and local public health agencies report to CDC. Some jurisdictions’ data may include data submitted by tribes. 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. Quality and completeness of data may vary across jurisdictions. Influenza vaccination coverage denominators are obtained from 2020 U.S. Census Bureau population estimates.

• Monthly estimates shown are cumulative, reflecting all persons vaccinated from July 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.

• Because IIS data contain all vaccinations administered within a jurisdiction rather than a sample, standard errors were not calculated and statistical testing for differences in estimates across years were not performed.

• 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. More information on laws and policies are found at https://www.cdc.gov/vaccines/programs/iis/policy-legislation.html.

• Coverage estimates based on IIS data are expected to differ from National Immunization Survey (NIS) estimates for children (https://www.cdc.gov/flu/fluvaxview/dashboard/vaccination-coverage-race.html)
and adults (https://www.cdc.gov/flu/fluvaxview/dashboard/vaccination-adult-coverage.html) because NIS 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, and quality and completeness of IIS data may vary across jurisdictions. In general, NIS estimates tend to overestimate coverage due to overreporting and IIS estimates may underestimate coverage due to incompleteness of data in certain jurisdictions.
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按流感季、年龄组及管辖区域划分的、接种≥1剂流感疫苗的人数与占比月度累计数据

• 儿童与成人的流感疫苗接种覆盖率，通过美国各管辖区域的免疫信息系统（Immunization Information Systems, IIS）数据进行评估，该数据由各管辖区域按月以年龄组为单位汇总后提交至美国疾病控制与预防中心（Centers for Disease Control and Prevention, CDC）。关于免疫信息系统的更多详情可访问：https://www.cdc.gov/vaccines/programs/iis/about.html。

• 流感疫苗接种覆盖率估算的分子项，为某一流感季内至少接种1剂流感疫苗的人数，数据来源于各州、领地及地方公共卫生机构提交至CDC的信息。部分管辖区域的数据可能包含部落提交的相关数据。估算范围涵盖已去世但在当季接种过疫苗的人群。接种疫苗的人员将被划归至其居住的管辖区域，除非另有说明。各管辖区域的数据质量与完整性存在差异。流感疫苗接种覆盖率估算的分母项，取自2020年美国人口普查局的人口估算数据。

• 本次展示的月度估算值为累计值，反映了从该流感季的7月至指定月份期间所有已接种疫苗的人员。累计估算值包含自上次提交以来上报的所有历史数据。由于并非所有美国管辖区域目前都向CDC提交IIS数据，因此未展示全国估算值。向CDC上报数据的管辖区域包括美国各州、部分地方行政区及领地。

• 由于IIS数据涵盖了某一管辖区域内接种的所有疫苗，而非抽样数据，因此未计算标准误，也未开展不同年份估算值间的统计学显著性检验。

• 各州关于向IIS提交疫苗接种数据的法律法规与政策存在差异，这可能会影响某一管辖区域所上报的疫苗接种覆盖率数据的完整性。关于相关法律法规与政策的更多详情可访问：https://www.cdc.gov/vaccines/programs/iis/policy-legislation.html。

• 基于IIS数据的覆盖率估算值，与儿童流感疫苗接种覆盖率（https://www.cdc.gov/flu/fluvaxview/dashboard/vaccination-coverage-race.html）及成人流感疫苗接种覆盖率（https://www.cdc.gov/flu/fluvaxview/dashboard/vaccination-adult-coverage.html）的全国免疫接种调查（National Immunization Survey, NIS）估算值存在差异。原因在于：NIS估算值基于抽样数据，经加权后可能不具备代表性，且疫苗接种状态由调查受访者自行报告，而非基于疫苗接种记录或实际接种情况；同时各管辖区域IIS数据的质量与完整性存在差异。总体而言，NIS估算值因报告偏倚存在高估倾向，而部分管辖区域因数据不完整，IIS估算值可能存在低估倾向。