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Volume 27, Number 9—September 2021
Research

Transmission of Severe Acute Respiratory Syndrome Coronavirus 2 to Close Contacts, China, January–February 2020

Yu Li1, Jianhua Liu1, Zhongcheng Yang1, Jianxing Yu, Chengzhong Xu, Aiqin Zhu, Hao Zhang, Xiaokun Yang, Xin Zhao, Minrui Ren, Zhili Li, Jinzhao Cui, Hongting Zhao, Xiang Ren, Chengxi Sun, Ying Cheng, Qiulan Chen, Zhaorui Chang, Junling Sun, Lance E. Rodewald, Liping Wang, Luzhao Feng, George F. Gao2, Zijian Feng2, and Zhongjie LiComments to Author 
Author affiliations: Chinese Center for Disease Control and Prevention, Beijing, China (Y. Li, J. Yu, A. Zhu, X. Yang, M. Ren, Zhili Li, J. Cui, H. Zhao, X. Ren, C. Sun, Y. Cheng, Q. Chen, Z. Chang, J. Sun, L.E. Rodewald, L. Wang, L. Feng, G.F. Gao, Z. Feng, Zhongjie Li); Yichang Center for Disease Control and Prevention, Yichang, China (J. Liu, Z. Yang, C. Xu, H. Zhang, X. Zhou)

Main Article

Table 2

Secondary attack rate for coronavirus disease, overall and by characteristic, China, January–February 2020

Characteristic Close contacts, no. Secondary cases, no. (%) p value
Overall
 2,382
 156 (6.5)
Contact
Type of contact <0.001
Living together 1,020 110 (10.8)
Eating together 835 33 (4.0)
Care 80 2 (2.5)
Sharing vehicle 68 1 (1.5)
Stay in a confined space 379 10 (2.6)
Most recent contact with index case-patient 0.023
Before illness onset 686 32 (4.7)
After illness onset 1,696 124 (7.3)
Whether contacts and index case-patients were spouses <0.001
   No 2,105 112 (5.3)
   Yes
 277
 44 (15.9)
Close contacts
Age <0.001
   <18 y 267 8 (3.0)
   18–59 y 1,559 89 (5.7)
   >60 y 465 58 (12.5)
Sex 0.644
   M 1,162 71 (6.1)
   F
 1,198
 83 (6.9)
Index case-patients
Age <0.001
   <18 y 86 0
   18–59 y 1,747 90 (5.2)
   >60 y 549 66 (12.0)
Sex 0.704
   M 1,303 82 (6.3)
   F 1,079 74 (6.9)

Main Article

1These authors contributed equally to this article.

2These authors are the senior authors.

Page created: June 21, 2021
Page updated: August 17, 2021
Page reviewed: August 17, 2021
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
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