Meanwhile, D2V-HN89 was most close to D2V-Jamaica and D2V-Brazil90. The cytopathogenic effect of D2V-HN89 and D2V-NGC were similar but the neural virulence of D2V-HN89 in suckling mice was much weaker than that of D2V-NGC.

• D2V HN89株的细胞病变效应与D2V NGC株相同 ,但对乳小白鼠神经毒力较弱。