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Volume 21, Number 7—July 2015

Letter

Seropositivity for Avian Influenza H6 Virus among Humans, China

Li Xin, Tian Bai, Jian Fang Zhou, Yong Kun Chen, Xiao Dan Li, Wen Fei Zhu, Yan Li, Jing Tang, Tao Chen, Kun Qin, Jing Hong Shi, Rong Bao Gao, Da Yan Wang, Ji Ming Chen, and Yue Long Shu
Author affiliations: National Institute for Viral Disease Control and Prevention, Beijing, China (L. Xin, T. Bai, J.F. Zhou, Y.K. Chen, X.D. Li, W.F. Zhu, Y. Li, J. Tang, T. Chen, K. Qin, J.H. Shi, R.B. Gao, D.Y. Wang, Y.L. Shu); China Animal Health and Epidemiology Center, Qingdao, China (J.M. Chen)

Main Article

Table

Seropositivity of occupationally exposed populations for the influenza (H6N2) virus, China, 2009–2011*

Population Total no. serum samples Mean titer for MN ≥20 No. serum samples with MN ≥20 Seropositivity (95% CI) Odds ratio† (95% CI)
Total
15,689
32.70
63
0.40 (0.40–0.41)

Occupation
Live poultry market 3,950 43.08 26 0.66 (0.64–0.68) 2.10 (1.27–3.47)
Poultry farm 3,762 25.71 7 0.19 (0.18–0.19) 0.40 (0.18–0.87)
Backyard poultry farm 4,324 26.67 18 0.42 (0.40–0.43) 1.05 (0.61–1.82)
Poultry slaughter factory 1,235 30.00 2 0.16 (0.15–0.17) 0.38 (0.09–1.57)
Wild bird habitat 788 20.00 4 0.51 (0.47–0.54) 1.28 (0.47–3.54)
Other
1,630
23.33
6
0.37 (0.35–0.39)
0.91 (0.39–2.11)
Sex
F 7,620 24.29 28 0.37 (0.36–0.38) Reference
M
8,069
39.39
35
0.43 (0.42–0.44)
1.18 (0.72–1.94)
Age group, y
Children, <14 74 0 0 0 (0)
Youth, 15–24 1,168 20.00 3 0.26 (0.24–0.27) 0.75 (0.19–3.00)
Adult, 25–59 1,2450 34.07 54 0.43 (0.43–0.44) 1.27 (0.54–2.94)
Elderly, >60 1,748 13.33 6 0.34 (0.33–0.36) Reference
No age record
249

0
0

Geographic distribution
South 10,522 32.00 50 0.48 (0.47–0.48) Reference
North 5,167 35.38 13 0.25 (0.24–0.26) 0.59 (0.30–1.15)

*MN, microneutralization; –, not applicable
†Odds ratios were calculated by using unconditional logistic regression model (SPSS 17.0, Armonk, NY, USA).

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