Molecular epidemiology of large coronavirus disease 2019 (COVID-19) clusters before and after the implementation of routine serial testing at an academic medical center in Iowa, 2020

Miguel E. Ortiz MD1a , Takaaki Kobayashi MD1a, Katherine Imborek MD1, Mohammed Alsuhaibani MBBS1, Stephanie Holley MBA1, Alexandra Trannel MS1, Alexandre R. Marra MD, PhD12, William Etienne MD1, Kyle E. Jenn BSN1, Oluchi J. Abosi MBChB, MPH1, Holly MeachamMSN1, Lorinda Sheeler PhD1, Angelique Dains BSN1, Mary E. Kukla BSN1, Paul B. McCrayJr MD1, Stanley PerlmanMD, PhD1, Bradley FordMD, PhD1, Daniel J. DiekemaMD1, Melanie Wellington MD, PhD1, Alejandro A. Pezzulo MD1b and Jorge L. Salinas MD1b 1University of Iowa Roy J. and Lucille A. Carver College of Medicine, Iowa City, Iowa, United States and 2Instituto Israelita de Ensino e Pesquisa Albert Einstein, Hospital Israelita Albert Einstein, São Paulo, Brazil