Post-infection immunity was very protective against Delta, the C.D.C. reports, but vaccines still offer the best defense. - fasttrack

NYT

Post-infection immunity was very protective against Delta, the C.D.C. reports, but vaccines still offer the best defense.

Post-infection immunity was very protective against Delta, the C.D.C. reports, but vaccines still offer the best defense.

NYT

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By BY APOORVA MANDAVILLI from NYT Health https://ift.tt/3AsFdMB

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