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abstractpubmed· Abstract 2020· item PMID:32521222

Clusters of Coronavirus Disease in Communities, Japan, January-April 2020. We analyzed 3,184 cases of coronavirus disease in Japan and identified 61 case-clusters in healthcare and other care facilities, restaurants and bars, workplaces, and music events. We also identified 22 probable primary case-patients for the clusters; most were 20-39 years of age and presymptomatic or asymptomatic at virus transmission.