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Volume 25, Number 12—December 2019

Research

Avian Influenza A Viruses among Occupationally Exposed Populations, China, 2014–2016

Chuansong Quan1, Qianli Wang1, Jie Zhang, Min Zhao, Qigang Dai, Ting Huang, Zewu Zhang, Shenghua Mao, Yifei Nie, Jun Liu, Yun Xie, Baorong Zhang, Yuhai Bi, Weifeng Shi, Peipei Liu, Dayan Wang, Luzhao Feng, Hongjie YuComments to Author , William J. LiuComments to Author , and George F. GaoComments to Author 
Author affiliations: National Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China (C. Quan, J. Zhang, P. Liu, D. Wang, W.J. Liu, G.F. Gao); Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, China (C. Quan, W. Shi); Fudan University School of Public Health, Shanghai, China (Q. Wang, H. Yu); Institute of Microbiology, Chinese Academy of Sciences, Beijing (M. Zhao, Y. Bi, G.F. Gao); Jiangsu Provincial Center for Disease Control and Prevention, Nanjing, China (Q. Dai); Sichuan Provincial Center for Disease Control and Prevention, Chengdu, China (T. Huang); Dongguan Municipal Center for Disease Control and Prevention, Dongguan, China (Z. Zhang); Shanghai Municipal Center for Disease Control and Prevention, Shanghai (S. Mao); Henan Provincial Center for Disease Control and Prevention, Zhengzhou, China (Y. Nie); Zaozhuang Center for Disease Control and Prevention, Zaozhuang, China (J. Liu); Jiangxi Provincial Center for Disease Control and Prevention, Nanchang, China (Y. Xie); Aviation General Hospital, Beijing (B. Zhang); Chinese Center for Disease Control and Prevention, Beijing (L. Feng, G.F. Gao)

Main Article

Table 2

Characteristics of study participants in serosurveys for avian influenza viruses, China, 2014–2016*

Variables 2014 Dec, 
n = 700 2015 Apr, 
n = 506 2015 Dec, n = 481 2016 Apr, n = 437 Total, 
n = 2,124 χ2† p value
Sex, no. (%)
M 369 (52.7) 264 (52.2) 278 (51.8) 236 (54.0) 1,147 (54.0) 3.94 0.27
F
 331 (47.3)
 242 (47.8)
 203 (42.2)
 201 (46.0)
 977 (46.0)
Age, y, no. (%)‡
<21 10 (1.4) 6 (1.2) 4 (0.8) 11 (2.5) 31 (1.5) 1.43 0.23
21–40 212 (30.3) 144 (28.5) 164 (34.1) 144 (33) 664 (31.3)
41–60 394 (56.3) 308 (60.9) 254 (52.8) 232 (53.1) 1,188 (55.9)
>60 78 (11.1) 47 (9.3) 55 (11.4) 50 (11.4) 230 (10.8)
Missing data 6 (0.9) 1 (0.2) 4 (0.8) 0 11 (0.5)
Median age (range)§
 46 (38–52)
 47 (38–52)
 45 (35–52)
 45 (35–52)
 46 (36–52)
 6.62
 0.08
Type of poultry exposure, no. (%)¶
Processing 155 (22.1) 107 (21.1) 118 (24.5) 94 (21.5) 474 (22.3) 27.88 0.006
Selling 423 (60.4) 332 (65.6) 299 (62.2) 191 (43.7) 1,243 (58.5)
Transportation 39 (5.6) 31 (6.1) 24 (5) 21 (4.8) 115 (5.4)
Feeding 191 (27.3) 125 (24.7) 124 (25.8) 93 (21.3) 533 (25.1)
Others 59 (8.4) 35 (6.9) 25 (5.2) 48 (11) 167 (7.9)
Missing data
 0
 0
 2 (0.4)
 0
 2 (0.1)
Length of poultry exposure, y (range)§
 8 (3–15)
 8 (3–15)
 5 (2–10)
 5 (3–10)
 6 (3–13)
 61.63
 <0.001
Vaccinated against seasonal influenza, no. (%) 23 (3.3) 8 (1.6) 20 (4.2) 8 (1.8) 59 (2.8) 8.20 0.04

*Some participants participated in >1 survey.
†By χ2 test, unless otherwise indicated.
‡By χ2CMH test. Missing data were not calculated.
§By Kruskal-Wallis test.
¶Most participants had multiple exposure types. Sums of percentages exceed 2,124. Missing data were not calculated.

Main Article

1These authors contributed equally to this article.

Page created: November 18, 2019
Page updated: November 18, 2019
Page reviewed: November 18, 2019
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