Clusters of Coronavirus Disease in Communities, Japan, January–April 2020
Yuki Furuse
1, Eiichiro Sando
1, Naho Tsuchiya
1, Reiko Miyahara
1, Ikkoh Yasuda
1, Yura K. Ko
1, Mayuko Saito, Konosuke Morimoto, Takeaki Imamura, Yugo Shobugawa, Shohei Nagata, Kazuaki Jindai, Tadatsugu Imamura, Tomimasa Sunagawa, Motoi Suzuki, Hiroshi Nishiura, and Hitoshi Oshitani
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)
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Figure 2
Figure 2. Analysis of probable primary cases of coronavirus disease (COVID-19) among 22 clusters in communities, Japan. A) Age ranges of probable primary COVID-19 cases in clusters. Age distribution among all COVID-19 cases in Japan is provided as reference. B) Proportions of symptoms among probable primary cases of COVID-19 clusters at transmission (n = 16) and among at laboratory confirmed diagnosis (n = 22). 1, Asymptomatic; 2, fever; 3, fatigue; 4, cough; 5, sore throat; 6, headache; 7, arthralgia or myalgia; 8, runny nose; 9, diarrhea; 10, difficulty breathing. C) Distribution of probable primary cases of COVID-19 clusters by time of transmission compared with illness onset by age groups (n = 16). Six cases were excluded because the time of transmission was undetermined.
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