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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 MatsumuraComments to Author , Miki Nagao, Masaki Yamamoto, Yasuhiro Tsuchido, Taro Noguchi, Koh Shinohara, Satomi Yukawa, Hiromi Inoue, and Takeshi Ikeda
Author affiliations: Kyoto University Graduate School of Medicine, Kyoto, Japan (Y. Matsumura, M. Nagao, M. Yamamoto, Y. Tsuchido, T. Noguchi, K. Shinorara, S. Yukawa); Health and Welfare Bureau of Kyoto City, Kyoto (H. Inoue, T. Ikeda)

Main Article

Table 3

Characteristics of 206 households whose members were infected with SARS-CoV-2 B.1.1.214 or Alpha variants, Kyoto, Japan, November 2020–May 2021*

Variables Alpha Non-VOC p value
No. households
 106
 100
Median household size 3 4
IQR 3–4 3–4 0.19
Range
 2–10
 2–9
No. index cases 106 100
Median age, y 38 47.5
IQR 23–56 27.75–58 0.12
Range 5–93 7–91
Sex, no. (%)
M 73 (68.9) 70 (70.0) 0.95
F
 33 (31.1)
 30 (30.0)
No. household contacts 282 282
Median age, y 35.5 35.5
IQR 13–53 16–52 0.96
Range 0–90 1–95
Sex, no. (%)
M 129 (45.7) 130 (46.1) 0.90
F 153 (54.3) 152 (53.9)

*Alpha variant B.1.1.7 or non-VOC B.1.1.214. IQR, interquartile range; VOC, variant of concern.

Main Article

Page created: June 08, 2022
Page updated: July 21, 2022
Page reviewed: July 21, 2022
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