7.Phylogenetic analysis of the NA genes showed the NA of A/Equine/Qinghai/1/94 had 98.2 %~97.4 %nucleotide similarity with the reference strains like A/Equine/Alaska/1/91、 A/Equine/Tennessee /5/86、 and A/Equine /Algiers/72;
10.All of the evidences indicated that the isolated virus was equine rhinopneumonitis virus(ERV),and it was named PH93 1 strain of equine rhinopneumonitis virus.