N Engl J Med 2021 Jul 28. Epub 2021 Jul 28.
From the Infection Prevention and Control Unit (M.B., T.G., C.C., E.G.L., C.R., I.T., M.Z., G.R.-Y.), the Department of Clinical Microbiology (S.A.), General Management (Y.K.), and the Central Virology Laboratory, Public Health Authority, Ministry of Health (Y.L., M.M., V.I., N.Z.), Sheba Medical Center Tel Hashomer, Ramat Gan, Sackler School of Medicine, Tel Aviv University, Tel Aviv (T.G., Y.L., M.M., E.G.L., Y.K., G.R.-Y.), and the Laboratory Wing, Asaf Harofe Medical Center, Be'er Ya'akov (A.B.-C.) - all in Israel; St. George's School of Medicine of London and Faculty of Medicine, University of Nicosia, Nicosia, Cyprus (M.B.); and Harvard T.H. Chan School of Public Health, Boston (M.L.).
Background: Despite the high efficacy of the BNT162b2 messenger RNA vaccine against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), rare breakthrough infections have been reported, including infections among health care workers. Data are needed to characterize these infections and define correlates of breakthrough and infectivity.
Methods: At the largest medical center in Israel, we identified breakthrough infections by performing extensive evaluations of health care workers who were symptomatic (including mild symptoms) or had known infection exposure. Read More