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Volume 15, Number 10—October 2009

Research

Lack of Airborne Transmission during Outbreak of Pandemic (H1N1) 2009 among Tour Group Members, China, June 2009

Ke Han1, Xiaoping Zhu1, Fan He1, Lunguang Liu, Lijie Zhang, Huilai Ma, Xinyu Tang, Ting Huang, Guang ZengComments to Author , and Bao-Ping Zhu
Author affiliations: Chinese Center for Disease Control and Prevention, Beijing, People’s Republic of China (K. Han, F. He, L. Zhang, H. Ma, G. Zeng, B.-P. Zhu); Guangdong Center for Disease Control and Prevention, Guangzhou, People’s Republic of China (K. Han); Zhejiang Center for Disease Control and Prevention, Hangzhou, People’s Republic of China (F. He); Sichuan Center for Disease Control and Prevention, Sichuan, People’s Republic of China (X. Zhu, L. Liu, X. Tang, T. Huang)

Main Article

Table 2

Secondary attack rate of influenza A pandemic (H1N1) 2009 among the tour group members, by exposure, Sichuan Province, China, June 2009*

Exposure Total no. persons No. cases Secondary attack rate, % Rate ratio (95% CI)
Seat proximity to index case-patient during flight CZ6659, Chengdu–Jiuzhaigou, June 3
>2 rows 19 5 26 Referent
<2 rows
 4
 2
 50
 1.9 (0.18–2.8)
Seat proximity to index case-patient during bus rides
Never <2 rows 8 2 25 Referent
Ever <2 rows
 22
 7
 32
 1.3 (0.35–5.7)
Talked with index case-patient from <2 m for >2 min
Yes 16 9 56 ∞ (2.4–∞)
No
 14
 0
 0
 Referent
Length of conversation with index case-patient
>10 min 10 8 80 4.8 (1.2–70)
2–9 min 6 1 17 Referent

*CI, confidence interval.

Main Article

1These authors contributed equally to this article.

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