Effectiveness of BNT162b2 mRNA COVID-19 vaccine against SARS-CoV-2 variant Beta (B.1.351) among persons identified through contact tracing in Israel: A prospective cohort study by Shepherd R. Singer, M.D., Frederick J. Angulo, Ph.D., David L. Swerdlow, M.D., John M. McLaughlin, Ph.D., Itay Hazan, M.Sc., Netanel Ginish, B.S, Emilia Anis, M.D., Ella Mendelson, Ph.D., Orna Mor, Ph.D., Neta S Zuckerman, Ph.D., Oran Erster, Ph.D., Jo Southern, Ph.D., Kaijie Pan, M.S., Gabriel Mircus, Ph.D., Marc Lipsitch, D.Phil., Eric J. Haas, M.D., Luis Jodar, Ph.D., Yeheskel Levy, M.D., Sharon Alroy-Preis, M.D.

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