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Safety of JN.1-Updated mRNA COVID-19 Vaccines

JAMA Network Open 10.1001/jamanetworkopen.2025.23557

July 28, 2025 at 11:00 AM EDT

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This cohort study investigates the association between booster vaccinations containing the JN.1 lineage and 29 serious adverse events in Denmark.

Corresponding Author: Niklas Worm Andersson, MD, PhD, Department of Epidemiology Research, Statens Serum Institut, Artillerivej 5, Copenhagen S 2300, Denmark (nian@ssi.dk).

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