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Volume 19, Number 8—August 2013


Monitoring Avian Influenza A(H7N9) Virus through National Influenza-like Illness Surveillance, China

Cuiling Xu, Fiona Havers, Lijie Wang, Tao Chen, Jinghong Shi, Dayan Wang, Jing Yang, Lei Yang, Marc-Alain Widdowson, and Yuelong ShuComments to Author 
Author affiliations: Chinese Center for Disease Control and Prevention, Beijing, China (C. Xu, L. Wang, T. Chen, J. Shi, D. Wang, J. Yang, L. Yang, Y. Shu); US Centers for Disease Control and Prevention, Atlanta, Georgia, USA. (F. Havers, M.-A. Widdowson)

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Table 1

Number of ILI patients, by age, positive for avian influenza A(H7N9) virus, China, March 4–April 28, 2013*

Patient age, y No. positive/no. tested
Persons from 10 outbreak-affected areas† Persons from 21 non-affected provinces
0–4 2/6,333 0/10,419
5–14 0/3,702 0/4,452
15–24 0/3,210 0/3,259
25–59 3/6,109 0/6,627
>60 1/1,385 0/1,311
Total 6/20,739 0/26,068

*ILI, influenza-like illness.
†Areas include Beijing and Shanghai Municipalities and Anhui, Jiangsu, Zhejiang, Shandong, Henan, Fujian, Jiangxi, and Hunan Provinces.

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