Increased household secondary attacks rates with Variant of Concern SARS-CoV-2 index cases.
Sarah E WilsonSemra TibebuNick DanemanMichael WhelanThuva VanniyasingamMichelle MurtiKevin A BrownPublished in: Clinical infectious diseases : an official publication of the Infectious Diseases Society of America (2021)
We compared secondary attack rates in households with B.1.1.7 variant of concern (VOC) versus non-VOC index cases in a matched cohort in Ontario, Canada. The secondary attack rate for VOC index cases was 1.31 times higher than non-VOC index cases. This increase was particularly accentuated for asymptomatic or presymptomatic index cases.