Alliance for Pandemic Preparedness

April 20, 2021

Attack Rates amongst Household Members of Outpatients with Confirmed COVID-19 in Bergen, Norway: A Case-Ascertained Study

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  • The overall SARS-CoV-2 household attack rate was 45% among 112 index cases and 179 total household contacts in a study conducted in Norway from February to April 2020. Attack rates were equally high in children (48%) and young adults (42%). The attack rate was not associated with household size or with whether or not the household included children. Attack rates were as high as 42% among symptomatic members with a negative PCR test.  Seropositivity for SARS-CoV-2 IgG antibodies 6-8 weeks after inclusion in the study identified more infections than PCR testing.

Kuwelker et al. (Mar 31, 2021). Attack Rates amongst Household Members of Outpatients with Confirmed COVID-19 in Bergen, Norway: A Case-Ascertained Study. The Lancet Regional Health – Europe. https://doi.org/10.1016/j.lanepe.2020.100014