The hemagglutinin-esterase ( HE ) gene of Breda virus serotype 2 ( BRV-2 ) has been identified and the nucleotide sequence for BRV serotype 1 ( BRV-1 ) genome which contains the open reading frames for the viral structural proteins has been reported revealing the presence of a 1.25 kb gene whose nucleotide sequence is identical to that of the BRV-2 HE gene.