Children’s Birthday Gatherings and SARS-CoV-2 Infection in Grandparents

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The study investigates the impact of children's birthday parties on SARS-CoV-2 transmission to grandparents in Denmark.
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Children's birthdays were used as markers for increased intergenerational contact during the COVID-19 pandemic.
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The primary outcome measured was positive SARS-CoV-2 test results among grandparents linked to birthday celebrations.
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Data were collected from Denmark's extensive health registers, ensuring high case ascertainment during the study period.
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The study utilized Cox proportional hazards regression to estimate the hazard ratios for SARS-CoV-2 infection risk.

Jama Network Open

by Laura Espenhain, Laust Hvas Mortensen, Lasse Engbo Christiansen, Christian Holm Hansen, Steen Ethelberg
July 13, 2026

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