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. |