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CDC Studies 'Breakthrough' COVID Cases Among People Already Vaccinated

A mass vaccination site at the Lumen Field Event Center in Seattle had plenty of takers for the COVID-19 vaccine when it opened in mid-March. Though some relatively rare cases of coronavirus infection have been documented despite vaccination, "I don't see anything that changes our concept of the vaccine and its efficacy," says Dr. Anthony Fauci of the National Institutes of Health. (AFP via Getty Images)
A mass vaccination site at the Lumen Field Event Center in Seattle had plenty of takers for the COVID-19 vaccine when it opened in mid-March. Though some relatively rare cases of coronavirus infection have been documented despite vaccination, "I don't see anything that changes our concept of the vaccine and its efficacy," says Dr. Anthony Fauci of the National Institutes of Health. (AFP via Getty Images)

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