Title Prevalence of avian influenza virus in wild birds before and after the HPAI H5N8 outbreak in 2014 in South Korea
Author Jeong-Hwa Shin1, Chanjin Woo1, Seung-Jun Wang1, Jipseol Jeong1, In-Jung An1, Jong-Kyung Hwang1, Seong-Deok Jo1, Seung Do Yu1, Kyunghee Choi1, Hyen-Mi Chung2, Jae-Hwa Suh1*, and Seol-Hee Kim1*
Address 1Environmental Health Research Division, National Institute of Environmental Research, Incheon 404-708, Republic of Korea, 2Water Supply and Sewerage Research Division, National Institute of Environmental Research, Incheon 404-708, Republic of Korea
Bibliography Journal of Microbiology, 53(7),475-480, 2015,
DOI 10.1007/s12275-015-5224-z
Key Words avian influenza, HPAI, H5N8, migration
Abstract Since 2003, highly pathogenic avian influenza (HPAI) virus outbreaks have occurred five times in Korea, with four HPAI H5N1 outbreaks and one HPAI H5N8 outbreak. Migratory birds have been suggested to be the first source of HPAI in Korea. Here, we surveyed migratory wild birds for the presence of AI and compared regional AI prevalence in wild birds from September 2012 to April 2014 for birds having migratory pathways in South Korea. Finally, we investigated the prevalence of AI in migratory birds before and after HPAI H5N8 outbreaks. Overall, we captured 1617 migratory wild birds, while 18,817 feces samples and 74 dead birds were collected from major wild bird habitats. A total of 21 HPAI viruses were isolated from dead birds, and 86 low pathogenic AI (LPAI) viruses were isolated from captured birds and from feces samples. Spatiotemporal distribution analysis revealed that AI viruses were spread southward until December, but tended to shift north after January, consistent with the movement of migratory birds in South Korea. Furthermore, we found that LPAI virus prevalences within wild birds were notably higher in 2013?014 than the previous prevalence during the northward migration season. The data from our study demonstrate the importance of the surveillance of AI in wild birds. Future studies including in-depth genetic analysis in combination with evaluation of the movement and ecology of migratory birds might help us to bridge the gaps in our knowledge and better explain, predict, and ultimately prevent future HPAI outbreaks.