Pfizer Vaccine Efficacy

Adults without immunocompromising conditions vaccine effectiveness against COVID-19 hospitalization during March 11August 15 2021 was higher for the Moderna vaccine 93 than the Pfizer-BioNTech vaccine 88 and the Janssen vaccine. Nevertheless the vaccinated patients tended to be older people the Pfizer cohort had a median age of 68 and it was unclear whether vaccine effectiveness had changed.

Pfizer Says Covid 19 Vaccine Efficacy Erodes Over Time

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Are Vaccines Becoming Less Effective At Preventing Covid Infection Financial Times

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