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Covid-19 vaccine boosters may be necessary at some point. Here's what you need to know


Getty Images for Empire State Re
Monica Schipper/Getty Images
A healthcare worker administers the vaccine as the Empire State Building offers Covid-19 vaccines at its observatory on June 18
By Jacqueline Howard, CNN
Vaccine makers are preparing for a next possible phase of the Covid-19 vaccine rollout: booster doses.
The biopharmaceutical company Pfizer announced on Thursday that it has seen waning immunity from its coronavirus vaccine although efficacy in preventing serious illness remains high but did not detail the evidence. It said a third dose may be needed six to 12 months after full vaccination.
The company said it would publish “more definitive data soon” and in August would seek emergency use authorization from the US Food and Drug Administration for a booster dose. ....

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