Volume 28, Number 8—August 2022
Research
Transmissibility of SARS-CoV-2 B.1.1.214 and Alpha Variants during 4 COVID-19 Waves, Kyoto, Japan, January 2020–June 2021
Yasufumi Matsumura
, Miki Nagao, Masaki Yamamoto, Yasuhiro Tsuchido, Taro Noguchi, Koh Shinohara, Satomi Yukawa, Hiromi Inoue, and Takeshi Ikeda
, Miki Nagao, Masaki Yamamoto, Yasuhiro Tsuchido, Taro Noguchi, Koh Shinohara, Satomi Yukawa, Hiromi Inoue, and Takeshi Ikeda
Table 1
Reverse transcription PCR test positivity for close contacts of 5,061 COVID-19 case-patients, Kyoto, Japan, November 2020–March 2021
| Contact category | No. identified | No. (%) tested | No. (%) positive |
|---|---|---|---|
| Household members living together | 4,789 | 4,523 (94.4) | 1,128 (24.9) |
| Family living separately | 1,415 | 1,038 (73.4) | 150 (14.5) |
| School, including nursery | 1,755 | 1,696 (96.6) | 38 (2.2) |
| Workplace, working staff | 2,384 | 1,966 (82.5) | 169 (8.6) |
| Workplace, user | 1,114 | 1,030 (92.5) | 67 (6.5) |
| Friend | 1,566 | 1,174 (75.0) | 193 (16.4) |
| Others |
539 |
386 (71.6) |
39 (10.1) |
| Total | 13,562 | 11,813 (87.1) | 1,784 (15.1) |
Page created: June 08, 2022
Page updated: July 21, 2022
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