[1]Agriculture and Livestock National Laboratory-Sao Paulo LANAGRO-SP Ministry of Agriculture Livestock and Supplay MAPA Campinas Sao Paulo Brazil;
[2]Agriculture and Livestock National Laboratory-Minas Gerais LANAGRO-MG Ministry of Agriculture Livestock and Supplay MAPA Pedro Leopoldo Minas Gerais Brazil;
[3]U.S.Department of Agriculture Animal and Plant Health Inspection Service Veterinary Services National Veterinary Services Laboratories(NVSL) Ames IA USA;
Avian influenza virus; reference reagents; subtypes; quality control; Brazil;