TY - JOUR AU - Miyahara, Reiko AU - Tsuchiya, Naho AU - Yasuda, Ikkoh AU - Ko, Yura AU - Furuse, Yuki AU - Sando, Eiichiro AU - Nagata, Shohei AU - Imamura, Tadatsugu AU - Saito, Mayuko AU - Morimoto, Konosuke AU - Imamura, Takeaki AU - Shobugawa, Yugo AU - Nishiura, Hiroshi AU - Suzuki, Motoi AU - Oshitani, Hitoshi T1 - Familial Clusters of Coronavirus Disease in 10 Prefectures, Japan, February−May 2020 T2 - Emerging Infectious Disease journal PY - 2021 VL - 27 IS - 3 SP - 915 SN - 1080-6059 AB - 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%. KW - coronavirus disease KW - COVID-19 KW - respiratory infections KW - familial clusters KW - prefectures KW - Japan KW - severe acute respiratory syndrome coronavirus 2 KW - SARS-CoV-2 KW - viruses DO - 10.3201/eid2703.203882 UR - https://wwwnc.cdc.gov/eid/article/27/3/20-3882_article ER - End of Reference