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. 2020 Sep 25;7:562875. doi: 10.3389/fmed.2020.562875

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Copyright © 2020 Chen, Si, Tang, Zhang, Pan, An, Zhang, Xue, Wu, Chen, Zhang, Liu and Fu.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Pedigree of the clustered SARS-Cov-2 infection cases. Arrow indicates the proband (case 1). Case 2, 3, and 4 are close contacts of case 1. Full black fills indicate the individuals with COVID-19 symptoms (case 1 and 2), while partial black fills indicate asymptomatic carriers of SARS-CoV-2 (case 3 and 4).