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The Possibility of COVID-19 after Vaccination: Breakthrough Infections

https://web.archive.org/web/20210922064814/https://www.cdc.gov/coronavirus/2019-ncov/vaccines/effectiveness/why-measure-effectiveness/breakthrough-cases.html 

Updated September 7, 2021
Centers for Disease Control and Prevention (CDC)

“People who get vaccine breakthrough infections can be contagious.”

document
breakthrough cases,COVID-19,vaccines