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As breakthrough cases increase, is a booster shot needed?
This version of As Breakthrough Cases Increase Is A Booster Shot Needed 117616197923 - Breaking News | NBC News Clone was adapted by NBC News Clone to help readers digest key facts more efficiently.
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As breakthrough cases are on the rise, the CDC and FDA say booster shots are not needed yet. However, that guidance may change as Pfizer’s vaccine data suggests a third dose might be needed to boost protection against the delta variant. Miguel Almaguer reports. July 29, 2021
