Case-Control Study of Use of Personal Protective Measures and Risk for SARS-CoV 2 Infection, Thailand
Pawinee Doung-ngern, Rapeepong Suphanchaimat, Apinya Panjangampatthana, Chawisar Janekrongtham, Duangrat Ruampoom, Nawaporn Daochaeng, Napatchakorn Eungkanit, Nichakul Pisitpayat, Nuengruethai Srisong, Oiythip Yasopa, Patchanee Plernprom, Pitiphon Promduangsi, Panita Kumphon, Paphanij Suangtho, Peeriya Watakulsin, Sarinya Chaiya, Somkid Kripattanapong, Thanawadee Chantian, Emily Bloss, Chawetsan Namwat, and Direk Limmathurotsakul
Author affiliations: Ministry of Public Health, Nonthaburi, Thailand (P. Doung-ngern, R. Suphanchaimat, A. Panjangampatthana, C. Janekrongtham, D. Ruampoom, N. Daochaeng, N. Eungkanit, N. Pisitpayat, N. Srisong, O. Yasopa, P. Plernprom, P. Promduangsi, P. Kumphon, P. Suangtho, P. Watakulsin, S. Chaiya, S. Kripattanapong, T. Chantian, C. Namwat); Thailand Ministry of Public Health–US Centers for Disease Control and Prevention Collaboration, Nonthaburi (E. Bloss); Mahidol University, Bangkok, Thailand (D. Limmathurotsakul); University of Oxford, Oxford, United Kingdom (D. Limmathurotsakul)
Figure 2. Development and transmission of severe acute respiratory syndrome coronavirus 2 among asymptomatic contacts, Thailand, March–April 2020. Clusters indicate coronavirus disease (COVID-19) contacts from nightclubs (A); boxing stadiums (B), and the state enterprise office (C). Black nodes represent primary index patients, red dots cases (contacts of primary index patients who had COVID-19), green dots noninfected controls, and orange dots patients with confirmed COVID-19 who could not be contacted by the study team. Black lines represent household contacts, purple lines contacts at workplaces, and gray lines contacts at other locations.
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