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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(doi:10.1001/jamainternmed.2021.5814)
Editor’s Note: Please see the article for additional information, including other authors, author contributions and affiliations, conflict of interest and financial disclosures, and funding and support.
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JAMA Internal Medicine