Increased Household Secondary Attacks Rates With Variant of Concern Severe Acute Respiratory Syndrome Coronavirus 2 Index Cases
Sarah A. Buchan, Semra Tibebu, Nick Daneman, Michael Whelan, Thuva Vanniyasingam, Michelle Murti, Kevin A. Brown
Abstract
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.
Topics & Concepts
MedicineAsymptomaticAttack rateIndex (typography)Coronavirus disease 2019 (COVID-19)CohortSevere acute respiratory syndrome coronavirus 2 (SARS-CoV-2)2019-20 coronavirus outbreakCoronavirusPediatricsInternal medicineEnvironmental healthEpidemiologyVirologyOutbreakDiseaseInfectious disease (medical specialty)Computer scienceWorld Wide WebCOVID-19 epidemiological studiesVaccine Coverage and HesitancyCOVID-19 and Mental Health