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Familial Clusters of Coronavirus Disease in 10 Prefectures, Japan, February−May 2020

2021; Centers for Disease Control and Prevention; Volume: 27; Issue: 3 Linguagem: Inglês

10.3201/eid2703.203882

1080-6059

Reiko Miyahara, Naho Tsuchiya, Ikkoh Yasuda, Yura K Ko, Yuki Furuse, Eiichiro Sando, Shohei Nagata, Tadatsugu Imamura, Mayuko Saito, Konosuke Morimoto, Takeaki Imamura, Yugo Shobugawa, Hiroshi Nishiura, Motoi Suzuki, Hitoshi Oshitani,

COVID-19 Clinical Research Studies

Abstract 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%.