What The Study Did: In this study using national registry data from Sweden, family members without COVID-19 immunity had a lower risk of contracting COVID-19 as the number of family members with known immunity, either from a previous COVID-19 infection or full vaccination, increased.
Authors: Peter Nordström, M.D., Ph.D., of Umeå University in Umeå, Sweden, is the corresponding author.
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JAMA Internal Medicine