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Volume 26, Number 9—September 2020
Dispatch

Clusters of Coronavirus Disease in Communities, Japan, January–April 2020

Yuki Furuse1, Eiichiro Sando1, Naho Tsuchiya1, Reiko Miyahara1, Ikkoh Yasuda1, Yura K. Ko1, Mayuko Saito, Konosuke Morimoto, Takeaki Imamura, Yugo Shobugawa, Shohei Nagata, Kazuaki Jindai, Tadatsugu Imamura, Tomimasa Sunagawa, Motoi Suzuki, Hiroshi Nishiura, and Hitoshi OshitaniComments to Author 
Author 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 Cooperation Agency, Tokyo (T. Imamura); National Institute of Infectious Diseases, Tokyo (T. Sunagawa, M. Suzuki); Hokkaido University, Sapporo, Japan (H. Nishiura)

Main Article

Figure 1

Analysis of 61 clusters of coronavirus disease (COVID-19) cases in communities in Japan, January 15–April 4, 2020. A) Cumulative number of COVID-19 cases, including the proportion of local cases with epidemiologic links to known confirmed cases. B) Distribution of clusters by number of cases in a cluster by category. C) Incidence of clusters of cases according to epidemiologic week as determined by date of confirmation of the first case in a cluster. Incidence of COVID-19 cases (weekly number of

Figure 1. Analysis of 61 clusters of coronavirus disease (COVID-19) cases in communities in Japan, January 15–April 4, 2020. A) Cumulative number of COVID-19 cases, including the proportion of local cases with epidemiologic links to known confirmed cases. B) Distribution of clusters by number of cases in a cluster by category. C) Incidence of clusters of cases according to epidemiologic week as determined by date of confirmation of the first case in a cluster. Incidence of COVID-19 cases (weekly number of newly reported cases) in Japan and timing of two importation waves are also displayed. Epidemiologic week 3 corresponds to January 15, 2020, in panel A. The data and trend of imported cases were previously reported and described by Furuse et al. (8).

Main Article

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1These authors contributed equally to this article.

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