Clusters of Coronavirus Disease in Communities, Japan, January–April 2020Author affiliations: Kyoto University, Kyoto, Japan (Y. Furuse, K. Jindai); Nagasaki University, Nagasaki, Japan (E. Sando, I. Yasuda, K. Morimoto); Tohoku University, Sendai, Japan (N. Tsuchiya, Y.K. Ko, M. Saito, T. Imamura, S. Nagata, H. Oshitani); National Center for Global Health and Medicine, Tokyo, Japan (R. Miyahara); Niigata University, Niigata, Japan (Y. Shobugawa); Japan International C
