The mallard and spot-billed duck are representative migratory bird species wintering in the Republic of Korea. They can be a highly pathogenic avian influenza (HPAI) virus carrier during their wintering movement. From September 2014 to June 2015, 162 poultry farms were confirmed to have a HPAI infection. The current study estimated the home range of the mallard and spot-billed duck during the 2014/15 HPAI epidemics to explore the relationship between the wintering site of the migratory birds and the geographical locations of HPAI-infected farms. A Brownian bridge movement model was applied to estimate the home ranges of 13 mallards and three spot-billed ducks. As a result, 22 HPAI-infected poultry farms were located geographically in the 99% cumulative probability contour of the home range of the mallard, but no HPAI-infected poultry farm was found in spot-billed duck’s home range. In the case of one spot-billed duck, however, it has two wintering sites: Chungcheongnam-do and Jeollanam-do. Considering that migratory birds can be a major driven factor in HPAI virus transmission from wild birds to poultry farms, it is recommended for poultry farms located within the home range of migratory birds to increase their biosecurity level during wintering season of migratory birds.

INTRODUCTION
MATERIALS AND METHODS
2014/15 HPAI epidemics
Migratory birds’ movement data
RESULTS
DISCUSSION
CONCLUSION
ACKNOWLEDGEMENTS

• Eu-Tteum Kim(College of Veterinary Medicine and Institute of Veterinary Science, Kangwon National University, Chuncheon 24341, Gangwon-do, Korea)
• Hyeong-Woo Cho(Gannwon-do Veterinary Service Laboratory, Chuncheon 24341, Gangwon-do, Korea) | Hyeong-Woo Cho2
• Son-Il Pak(College of Veterinary Medicine and Institute of Veterinary Science, Kangwon National University, Chuncheon 24341, Gangwon-do, Korea) Corresponding author