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Emerg Infect Dis
. 2021 Mar;27(3):915-918.
doi: 10.3201/eid2703.203882.
Familial Clusters of Coronavirus Disease in 10 Prefectures, Japan, February-May 2020
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
- PMID: 33622475
- DOI: 10.3201/eid2703.203882
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%.
Keywords: COVID-19; Japan; SARS-CoV-2; coronavirus disease; familial clusters; prefectures; respiratory infections; severe acute respiratory syndrome coronavirus 2; viruses.