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Volume 24, Number 7—July 2018
Research

Avian Influenza A Virus Infection among Workers at Live Poultry Markets, China, 2013–2016

Mai-Juan Ma1Comments to Author , Teng Zhao1, Shan-Hui Chen, Xian Xia, Xiao-Xian Yang, Guo-Lin Wang, Li-Qun Fang, Guan-Yuan Ma, Meng-Na Wu, Yan-Hua Qian, Natalie E. Dean, Yang Yang, Bing LuComments to Author , and Wu-Chun CaoComments to Author 
Author affiliations: Beijing Institute of Microbiology and Epidemiology, Beijing, China (M.-J. Ma, T. Zhao, X. Xia, X.-X. Yang, G.-L. Wang, L.-Q. Fang, M.-N. Wu, W.-C. Cao); Wuxi Municipal Center for Disease Control and Prevention, Wuxi, China (S.-H. Chen, G.-Y. Ma, Y.-H. Qian, B. Lu); The PLA Army General Hospital, Beijing (X. Xia); Taihu University of Wuxi, Wuxi (X.-X. Yang); University of Florida, Gainesville, Florida, USA (N.E. Dean, Y. Yang)

Main Article

Table 1

Seroprevalence of microneutralization titers against influenza A(H7N9), A(H9N2), and A(H5N1) viruses in poultry workers, swine workers, and controls, eastern China, 2013–2016*

Antigen/year
 No. seropositive/no. total (% [95% CI])
Poultry workers
 Swine workers
 Controls
 p value
H7N9
2013 3/511 (0.58 [0.12–1.71]) 0/569 (0 [0–0.65]) 2/915 (0.22 [0.03–0.79]) 0.13
2014 3/533 (0.56 [0.12–1.64]) 1/589 (0.17 [0–0.94]) 1/881 (0.11 [0–0.63]) 0.19
2015 3/535 (0.56 [0.12–1.63]) 0/501 (0 [0–0.73]) 0/855 (0 [0–0.43]) 0.04
2016 0/491 (0 [0–0.75]) 1/367 (0.27 [0.01–1.51]) 1/785 (0.13 [0–0.71]) 0.48
Overall†
 9/964 (0.93 [0.43–1.76])
 2/1,079 (0.19 [0.02–0.67])
 4/1,545 (0.26 [0.07–0.66])
 0.03
H9N2
2013 1/511 (0.20 [0.01–1.09]) 0/569 (0 [0–0.65]) 2/915 (0.22 [0.03–0.79]) 0.61
2014 2/533 (0.38 [0.05–1.35]) 1/589 (0.17 [0–0.94]) 1/881 (0.11 [0–0.63]) 0.70
2015 11/535 (2.06 [1.03–3.65]) 0/501 (0 [0–0.73]) 4/855 (0.47 [0.13–1.19]) <0.001
2016 7/491 (1.43 [0.58–2.92]) 3/367 (0.82 [0.17–2.37]) 2/785 (0.25 [0.03–0.92]) 0.05
Overall†
 18/964 (1.87 [1.11–2.94])
 3/1,079 (0.28 [0.06–0.81])
 9/1,545 (0.58 [0.27–1.10])
 <0.001
H5N1
2013 1/511 (0.20 [0–1.09]) 0/569 (0 [0–0.65]) 0/915 (0 [0–0.40]) 0.26
2014 0/533 (0 [0–0.69]) 0/589 (0 [0–0.62]) 0/881 (0 [0–0.42]) NA
2015 0/535 (0 [0–0.69]) 0/501 (0 [0–0.73]) 0/855 (0 [0–0.43]) NA
2016 17/491 (3.46 [2.03–5.49]) 0/367 (0 [0–1.00]) 0/785 (0 [0–0.47]) <0.001
Overall† 18/964 (1.87 [1.11–2.94]) 0/1,079 (0 [0–0.34]) 0/1,545 (0 [0–0.24]) <0.001

*NA, the statistics were not performed because of 0 in the 2 groups.
†The overall seroprevalence was calculated as the number of seropositive persons divided by the number of all new enrolled persons during the study period.

Main Article

1These authors contributed equally to this article.

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Page updated: June 22, 2018
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