aKU Center for Food Safety, College of Veterinary Medicine, Konkuk University, Seoul, Korea
bDivision of Vaccine Research, Korea National Institute of Health, Osong, Korea
cSeoul Research Institute of Public Health and Environment, Gwachon, Korea
dDepartment of Infectious Diseases, College of Veterinary Medicine, Konkuk University, Seoul, Korea
© 2013 Published by Elsevier B.V. on behalf of Korea Centers for Disease Control and Prevention.