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Volume 19, Number 11—November 2013

Research

Use of National Pneumonia Surveillance to Describe Influenza A(H7N9) Virus Epidemiology, China, 2004–2013

Nijuan Xiang, Fiona Havers, Tao Chen, Ying Song, Wenxiao Tu, Leilei Li, Yang Cao, Bo Liu, Lei Zhou, Ling Meng, Zhiheng Hong, Rui Wang, Yan Niu, Jianyi Yao, Kaiju Liao, Lianmei Jin, Yanping Zhang, Qun Li, Marc-Alain Widdowson, and Zijian FengComments to Author 
Author affiliations: Chinese Center for Disease Control and Prevention, Beijing, China (N. Xiang, T. Chen, W. Tu, L. Li, Y. Cao, B. Liu, L. Zhou, L. Meng, Z. Hong, R. Wang, Y. Niu, J. Yao, K. Liao, L. Jin, Y. Zhang, Q. Li, Z. Feng); Centers for Disease Control and Prevention, Atlanta, Georgia, USA (F. Havers, M.-A. Widdowson); Centers for Disease Control and Prevention, USA/China, Beijing (Y. Song)

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Table 2

Number of reported PUE cases and number positive for influenza A(H7N9) virus in 10 affected areas, mainland China, March 30–May 3, 2013*

Age group, y Total patients
Male patients
Female patients
p value†
PUE, no. A(H7N9) positive, no. (%) PUE, no. A (H7N9) positive, no. (%) PUE, no. A(H7N9) positive, no. (%)
<1–4 68 0 44 0 24 0
5–14 92 1 (1) 52 0 40 1 (3) 0.435
15–24 128 0 64 0 64 0
25–59 399 42 (11) 195 28 (14) 204 14 (7)  0.015
>60 315 51 (16) 198 34 (17) 117 17 (15)  0.539
Total 1002 94 (9) 553 62 (11) 449 32 (7)  0.027

*PUE, pneumonia of unknown etiology.
†p value comparing proportion positive among males with proportion positive among females. Pearson χ2.

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