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I am the second

New data finds first Pfizer dose is highly effective, can be stored in normal freezers

Pfizer's coronavirus vaccine may be more effective after just one shot than researchers had previously realized, and can be stored for two weeks at standard temperatures typically found in pharmaceutical freezers and refrigerators, according to new data.

Why it matters: The findings about first-dose efficacy, which appear in a new analysis published in The Lancet, appear to support a strategy of delaying second shots in order to make the most of limited supplies. That's what the U.K. has done, and some experts have called for a similar approach in the U.S.

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