1. National Center for Veterinary DiagnosticsDepartment of Animal Health Hanoi Vietnam
2. Department of Animal HealthMinistry of Agriculture and Rural Development of Vietnam Hanoi Vietnam
3. Oxford University Clinical Research Unit Hanoi Vietnam
4. Center for Tropical Medicine and Global Health, Nuffield Department of Clinical MedicineUniversity of Oxford Oxford UK
5. Influenza Division, Centers for Disease Control and Prevention 30333 Atlanta GA USA
6. Department of ZoologyCambridge University Cambridge UK
7. The Pirbright Institute Pirbright UK
8. United States Department of AgricultureSoutheast Poultry Research Laboratory Athens GA USA