https://www.cdc.gov/ Jennifer K. Bender1 , Michael Brandl1, Michael Höhle, Udo Buchholz, and Nadine ZeitlmannAuthor affiliations: Robert Koch Institute, Wernigerode, Germany (J.K. Bender); European Centre for Disease Prevention and Control, Stockholm, Sweden (J.K. Bender, M. Brandl); Robert Koch Institute, Berlin, Germany (M. Brandl, M. Höhle, U. Buchholz, N. Zeitlmann); Stockholm University, Stockholm (M. Höhle); Federal Institute for Quality Assurance and Transparency in Healthcare, Berlin (M. Höhle) Suggested citation for this article Abstract We determined secondary attack rates (SAR) among close contacts of 59 asymptomatic and symptomatic coronavirus disease case-patients by presymptomatic and symptomatic exposure. We observed no transmission from asymptomatic case-patients and highest SAR through presymptomatic exposure. Rapid quarantine of close...