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 3
Reported PUE cases that were positive for influenza A(H7N9) virus before and after closure of live-bird markets in 3 cities, mainland China, March 30–May 3, 2013*
| Location | 0–6 d before closure† |
1–7 d after closure† |
8–14 d after closure† |
p value | |||||
|---|---|---|---|---|---|---|---|---|---|
| No. PUE | A(H7N9) positive, no. (%) | No. PUE | A(H7N9) positive, no. (%) | No. PUE | A(H7N9) positive, no. (%) | ||||
| Shanghai | 81 | 11 (14) | 188 | 4 (2) | 122 | 1 (1) | <0.001 | ||
| Nanjing | 7 | 5 (71) | 0 | 0 | 1 | 1 (100) | 0.564 | ||
| Hangzhou | 60 | 15 (25) | 34 | 4 (12) | 5 | 0 | 0.056 | ||
| Total | 148 | 31 (21) | 222 | 8 (4) | 128 | 2 (2) | <0.001 | ||
*PUE, pneumonia of unknown etiology.
†Dates of market closures: Shanghai: April 6; Nanjing: April 8; Hangzhou: April 15, 2013.
‡χ2 test for trend for percentage of reported cases testing positive for A(H7N9).
Page created: October 31, 2013
Page updated: October 31, 2013
Page reviewed: October 31, 2013
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