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CDC reported 10,262 vaccine breakthrough infections through April 2021. As of May 2021, "CDC transitioned from monitoring all reported COVID-19 vaccine breakthrough infections to investigating ONLY those among patients who are HOSPITALIZED OR DIE."https://www.cdc.gov/mmwr/volumes/70/wr/mm7021e3.htmHowever, the CDC webpage for vaccine breakthrough infections that resulted in hospitalization or death has still not been updated since July 19th 2021, at the time reporting 5,914 (hospitalized or dead) breakthrough cases. https://www.cdc.gov/vaccines/covid-19/health-departments/breakthrough-cases.html