1Roemer-OberdoerferA, Werner O, Veits J, et al. Contribution of the length of the HN protein and the sequence of the F protein cleavage site to Newcastle disease virus pathogenicity. J Gen Virol, 2003, 84 (11): 3121-3129.
4Alexander D J.Newcastle disease and other avian Paramyxoviridae infeetions[M]//Calnek B W.Diseases of Poultry.10th ed.Ames, IA. Iowa State University Press, 1997: 541-569.
6Takehara K, Shinomiya T, Kobayashi H, et al. Characterization of Newcastle disease virus isolated from field cases in Japan[J].Avian Diseases, 1987, 31 (1): 125-129.
7Huovilainen A, Ek-Kommonen C, Manvell R, et al. Phylogenetic analysis of avian paramyxovirus 1 strains isolated in Finland[J].ArchivesofVirology, 2001, 146 (9): 1775-1785.
8Gould A R, Kattenbeldt J A, Selleck P, et al.Virulent Newcastle in Australia: molecular epidemiological analysis of viruses isolated prior to and during the outbreak of 1998-2000[J]. Virus Research, 2001, 77 (1): 51-60.
9Westbury H. Newcastle disease virus: an evolving pathogen[J]. Avian Pathology, 2001, 30 (5). 5-11.
10De Leeuw O S, Hartog L, Koch G, et al. Effect of fusion protein cleavage site mutations on virulence of Newcastle disease virus, non-virulent cleavage site mutants revert to virulence after one passage in chicken brain[J]. Journal of General Virology, 2003, 84 (2), 475-484.
5Saif Y M. Disease of poultry [M]. 11th ed. Ames:Iowa State University Press,2003,64-87.
6世界动物卫生组织.诊断试验和疫苗标准手船[M].2004,140-146.
7Liu X F,Wan H P,Ni X X,et al. Pathotypica and genotypica characterization of strains of Newcastle disease virus isolated from outbreaks in chicken and goose in some regions of China during 1985-2001 [J]. Arch Viro1,2003,148 (7) : 1387-1403.
8Collins M S,Bashiruddin J B,Alexander D,et al. Deduced amino acid sequences at the fusion protein cleavage site of Newcastle disease viruses showing variation in antigenicity and pathogenicity[J]. Arch Virol,2003,128:363-370.
8Ballagi Pordany A, Wehmann E, Herezeg J, et al. Identification a grouping of Newcastle disease virus strains hy restriction site a nalysis of a region from the F gene. Archives of Virology, 1996, 141: 243-261.
9Yu L,Wang Z L, Jiang Y H, et al. Characterization of newly e- merging Newcastle disease Virus isolates from People's Republic of China a Taiwan. Journal of Clinical Microbiology, 2001, 39 (10) :3512-3519.
