[1] Univ Cambridge, Dept Zool, Cambridge, England
[2] Univ Cambridge, Dept Vet Med, Cambridge, England
[3] Wellcome Trust Sanger Inst, Hinxton, England
[4] USDA ARS, Virus & Pr Res Unit, Natl Anim Dis Ctr, Ames, IA USA
[5] Katholieke Univ Leuven, Rega Inst Med Res, Dept Microbiol & Immunol, Clin & Epidemiol Virol, Leuven, Belgium
[6] Univ Edinburgh, Inst Evolutionary Biol, Edinburgh, Midlothian, Scotland
[7] Erasmus MC, Dept Virosci, Rotterdam, Netherlands
[8] Natl Ctr Vet Diagnost, Dept Anim Hlth, Hanoi, Vietnam
[9] Natl Inst Anim Hlth, Bangkok, Thailand
[10] Univ Hong Kong, Sch Publ Hlth, Hong Kong, Hong Kong, Peoples R China
[11] Natl Inst Anim Hlth, Ibaraki, Japan
[12] Anses, Ploufragan Plouzane Lab, Swine Virol Immunol Unit, Ploufragan, France
[13] St Jude Childrens Res Hosp, 332 N Lauderdale St, Memphis, TN 38105 USA
[14] Univ Ghent, Fac Vet Med, Virol Lab, B-9000 Ghent, Belgium
[15] Anim Hlth & Plant Agcy, Weybridge, Surrey, England
[16] Tech Univ Denmark, Natl Vet Inst, Frederiksberg, Denmark
[17] Univ Amsterdam, Acad Med Ctr, Dept Med Microbiol, NL-1105 AZ Amsterdam, Netherlands