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

• Main Authors: Chuansong Quan, Qianli Wang, 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 Yu, William J. Liu, George F. Gao
• Format: Article
• Language: English
• Published: Centers for Disease Control and Prevention 2019-12-01
• Series: Emerging Infectious Diseases
• Subjects: seroepidemiologic study; seroprevalence; avian influenza virus; poultry worker; viruses; China
• Online Access: https://wwwnc.cdc.gov/eid/article/25/12/19-0261_article

To determine the seroprevalence and seroconversion of avian influenza virus (AIV) antibodies in poultry workers, we conducted a seroepidemiologic study in 7 areas of China during December 2014–April 2016. We used viral isolation and reverse transcription PCR to detect AIVs in specimens from live poultry markets. We analyzed 2,124 serum samples obtained from 1,407 poultry workers by using hemagglutination inhibition and microneutralization assays. We noted seroprevalence of AIV antibodies for subtypes H9N2, H7N9, H6N1, H5N1-SC29, H5N6, H5N1-SH199, and H6N6. In serum from participants with longitudinal samples, we noted seroconversion, with >4-fold rise in titers, for H9N2, H7N9, H6N1, H5N1-SC29, H6N6, H5N6, and H5N1-SH199 subtypes. We found no evidence of H10N8 subtype. The distribution of AIV antibodies provided evidence of asymptomatic infection. We found that AIV antibody prevalence in live poultry markets correlated with increased risk for H7N9 and H9N2 infection among poultry workers.