The incidence of the omicron BA.1/1.1 variant of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which rapidly spread worldwide even among vaccinated persons, is incompletely defined.1 We quantified the incidence of SARS-CoV-2 infection during the initial omicron BA.1/1.1 variant wave among Canadian adults2 and the contribution of previous infection and concurrent vaccination to age specific active immunity.
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Patrick E. Brown, Ph.D.
Sze Hang Fu, M.S.A.
Aiyush Bansal, M.D.
Leslie Newcombe, B.Sc.
Unity Health Toronto, Toronto, ON, Canada
Karen Colwill, Ph.D.
Geneviève Mailhot, M.Sc.
Melanie Delgado-Brand, B.Sc.
Anne-Claude Gingras, Ph.D.
Sinai Health, Toronto, ON, Canada
Arthur S. Slutsky, M.D.
Maria Pasic, Ph.D.
Jeffrey Companion, M.L.T.
Unity Health Toronto, Toronto, ON, Canada
Isaac I. Bogoch, M.D.
Toronto General Hospital, Toronto, ON, Canada
Ed Morawski, M.A.
Teresa Lam, B.A.
Angus Reid, Ph.D.
Angus Reid Institute, Vancouver, BC, Canada
Prabhat Jha, M.D., D.Phil.
Unity Health Toronto, Toronto, ON, Canada
prabhat.jha@utoronto.ca
for the Ab-C Study Collaborators