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Archive of COVID-19 Vaccination Data Updates | CDC – CDC

CDC reports COVID-19 vaccination data online on COVID Data Tracker and in vaccination datasets. Sharing timely and accurate information with the public is one of CDC’s core activities. Timely and accurate reporting from jurisdictions provides the reliable data that can be reported by CDC. All reported numbers may change over time as updated data are continuously reported to CDC.
CDC communicates events that affect vaccine data through footnotes on COVID Data Tracker (CDT). This section serves as an archive of footnotes for historical COVID-19 vaccine data updates.  Reported changes to COVID-19 vaccine data can occur for the following reasons:
Vaccination Data Updates:
Jurisdictions continuously receive new and updated vaccination information from partners that may require updating and/or deleting older records to maintain current data accuracy. Occasionally, an organization will delete a record with data fields that cannot be updated and upload a replacement record with the correct information. As part of ongoing efforts to improve data quality and maintain accurate COVID-19 vaccination information, CDC has been working with states to remove duplicate or incorrect vaccination records and to add replacement records. These collaborative updates help to ensure CDC is publicly providing the best, most up-to-date data. This option became available for select entities on July 14, 2021 and was expanded to all entities starting August 9, 2021. Historical update and delete events for reporting entities and their impacts on vaccine data are reported below.
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