Author: Miyahara, Reiko; Tsuchiya, Naho; Yasuda, Ikkoh; Ko, Yura K.; Furuse, Yuki; Sando, Eiichiro; Nagata, Shohei; Imamura, Tadatsugu; Saito, Mayuko; Morimoto, Konosuke; Imamura, Takeaki; Shobugawa, Yugo; Nishiura, Hiroshi; Suzuki, Motoi; Oshitani, Hitoshi
                    Title: Familial Clusters of Coronavirus Disease in 10 Prefectures, Japan, February−May 2020  Cord-id: cxc6gg8x  Document date: 2021_3_25
                    ID: cxc6gg8x
                    
                    Snippet: The overall coronavirus disease secondary attack rate (SAR) in family members was 19.0% in 10 prefectures of Japan during February 22–May 31, 2020. The SAR was lower for primary cases diagnosed early, within 2 days after symptom onset. The SAR of asymptomatic primary cases was 11.8%.
                    
                    
                    
                     
                    
                    
                    
                    
                        
                            
                                Document: The overall coronavirus disease secondary attack rate (SAR) in family members was 19.0% in 10 prefectures of Japan during February 22–May 31, 2020. The SAR was lower for primary cases diagnosed early, within 2 days after symptom onset. The SAR of asymptomatic primary cases was 11.8%.
 
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