Protection by Face Masks against Influenza A(H1N1)pdm09 Virus on Trans-Pacific Passenger Aircraft, 2009
Lijie Zhang1, Zhibin Peng1, Jianming Ou1, Guang Zeng1, Robert E. Fontaine, Mingbin Liu, Fuqiang Cui, Rongtao Hong, Hang Zhou, Yang Huai, Shuk-Kwan Chuang, Yiu-Hong Leung, Yunxia Feng, Yuan Luo, Tao Shen, Bao-Ping Zhu, Marc-Alain Widdowson, and Hongjie Yu
Author affiliations: Chinese Center for Disease Control and Prevention, Beijing, China (L. Zhang, Z. Peng, G. Zeng, M. Liu, F. Cui, H. Zhou, Y. Feng, Y. Luo, T. Shen, B.-P. Zhu, H. Yu); Fujian Center for Disease Control and Prevention, Fuzhou, China (J. Ou, R. Hong); Nanchang Center for Disease Control and Prevention, Nanchang, China (M. Liu); Centers for Disease Control and Prevention, Atlanta, Georgia, USA (R. E. Fontaine, M.-A. Widdowson); China–US Collaborative Program on Emerging and Re-emerging Infectious Diseases, Beijing (Y. Huai); Hong Kong Department of Health, Hong Kong, China (S.-K. Chuang, Y.-H. Leung)
Figure 1. . Time of disease onset for persons infected with influenza A(H1N1)pdm09 virus on an international flight from New York, New York (NYC), to Hong Kong (HK) and Fujian Province (FU), China, May 2009. The most probable exposure period was calculated by subtracting median incubation time for influenza A(H1N1)pdm09 (2.5 days) from the time interval containing median onset of a case (pm, May 30). Beginning of the maximum exposure period was calculated by subtracting the maximum incubation period (5 days) from the midpoint of the interval containing onset of the most recent case (am, June 1). End of the maximum exposure period was calculated by subtracting the minimum incubation period (24 h) from the midpoint of the interval containing onset of first case (am, May 30).
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