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COVID-19 Breakthrough Case Investigations and Reporting | CDC
Information and resources to help public health departments and laboratories investigate and report COVID-19 vaccine breakthrough cases.
As previously announced, CDC is transitioning to reporting only patients with COVID-19 vaccine breakthrough infection that were hospitalized or died to help maximize the quality of the data collected on cases of greatest clinical and public health importance. That change in reporting will begin on May 14, 2021. In preparation for that transition, the number of reported breakthrough cases will not be updated on May 7, 2021.