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  4. In a trial, Pfizer-BioNTech’s low-dose shot did not provoke an adequate immune response in 2- to 5-year-olds.

In a trial, Pfizer-BioNTech’s low-dose shot did not provoke an adequate immune response in 2- to 5-year-olds.

10:42

By BY APOORVA MANDAVILLI AND REBECCA ROBBINS from NYT World https://ift.tt/3sf8pnX

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