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Delaying a COVID vaccine’s second dose boosts immune response

An elderly man receives a dose of the Pfizer-BioNTech COVID-19 vaccine at El-Menzah sports hall in Tunisia's capital.

A man in Tunis receives a dose of the Pfizer–BioNTech vaccine for COVID-19. Credit: Jdidi Wassim/SOPA Images/LightRocket via Getty

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  1. Parry, H. M. et al. Preprint at medRxiv (2021).

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