1. Department of Diagnostic Medicine/Pathobiology, Kansas State University, Manhattan, KS, USA
2. Present address: Department of Virology, Faculty of Veterinary Medicine, Zagazig University, Zagazig 44519, Egypt.
3. Innovation Team for Pathogen Ecology Research on Animal Influenza Virus, Department of Avian Infectious Disease, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, PR China
4. School of Animal Science, Fujian Agriculture and Forestry University, Fuzhou, PR China