Pfizer-BioNTech Vaccine's Estimated COVID-19 Effectiveness

JAMA Network

About The Study: The findings of this case-control study reaffirm current recommendations for broad age-based use of annually updated COVID-19 vaccines given that (1) the BNT162b2 XBB vaccine (Pfizer-BioNTech; 2023-2024 formulation) provided statistically significant additional protection against a range of COVID-19 outcomes and (2) older versions of COVID-19 vaccines offered little, if any, long-term protection, including against hospital admission, regardless of the number or type of prior doses received.

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