Division 3 For the purposes of this case definition, the disease agent responsible for infection with NDV must be any avian paramyxovirus type 1 (APMV-1) (avian Avulavirus type 1) that either:

has an intracerebral pathogenicity index (ICPI) of 0,7 or greater; or

presents multiple basic amino acids at the C-terminus of the F2 protein and phenylalanine at residue 117, which is the N-terminus of the F1 protein. The term ‘multiple basic amino acids’ refers to at least three arginine or lysine residues between residues 113 and 116. Failure to demonstrate the characteristic pattern of amino acid residues as described above would require characterisation of the isolated virus by an ICPI test. In this definition, amino acid residues are numbered from the N-terminus of the amino acid sequence deduced from the nucleotide sequence of the F0 gene (113–116 corresponds to residues –4 to –1 from the cleavage site).