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 Feng
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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