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This report estimates the risk of COVID-19 importation and secondary transmission associated with a modified quarantine programme in Canada. Prospective analysis of international asymptomatic travellers entering Alberta, Canada. All participants were required to receive a PCR COVID-19 test on arrival. If negative, participants could leave quarantine but were required to have a second test 6 or 7 days after arrival. If the arrival test was positive, participants were required to remain in quarantine for 14 days. Proportion and rate of part