• Can J Public Health · Feb 2021

    Secondary attack rate of COVID-19 in household contacts in the Winnipeg Health Region, Canada.

    • Krista Wilkinson, Xuan Chen, and Souradet Shaw.
    • Winnipeg Regional Health Authority, 490 Hargrave Street, Winnipeg, Manitoba, R3A 0X7, Canada. wilkinsk@myumanitoba.ca.
    • Can J Public Health. 2021 Feb 1; 112 (1): 12-16.

    ObjectivesUnderstanding important transmission parameters, such as secondary attack rates, can help in strategizing, prioritizing, and planning interventions to curb morbidity and mortality due to COVID-19. Early reports suggest the risk of transmission of SARS-CoV-2 (the pathogen that causes COVID-19 disease) is high among household contacts of cases. The purpose of this analysis was to determine the household transmissibility of SARS-CoV-2 in residents of the Winnipeg Health Region.MethodsWe extracted information on COVID-19 cases and their household contacts from the regional public health surveillance database and used this dataset to calculate secondary attack rates.ResultsWe included 381 individuals from 102 unique households (102 primary cases and 279 household contacts). A total of 41 contacts from 25 households became secondary cases in the 14 days since last unprotected exposure to the primary case, resulting in a secondary attack rate of 14.7% (95% CI: 10.5-18.8).ConclusionHousehold transmission of SARS-CoV-2 has been an important contributor to the local COVID-19 epidemic.

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