ALEXANDER, D. J. The pathogenicity of four avian influenza viruses for fowls, tukeys and ducks. Res. Vet. Sci. 1978, 24, 242-247
ALEXANDER, D. J. Ecological aspects of influenza A viruses in animals and their relationship to human influenza : a review. J. Roy. Soc. Med. 1982, 75, 799-811
ALEXANDER, D. J. An outbreak of highly pathogenic avian influenza inturkeys in Great Britain in 1991. Vet. Rec. 1993, 132, 535-536
ALLAN, W. Use of virulence index tests for avian influenza viruses. Avian Dis. 1977, 21, 359-363
BEARD, C. W. Avian influenza antibody detection by immunodiffusion. Avian Dis. 1970, 14, 337-341