Methods The human embryonal lung dipoid cell 2BS strains of the same lot were infected with L - A - 1 strain of hepatitis A virus and 27D3T strain of measles virus at an interval of 3 weeks.

• 方法应用甲肝L-A-1株和麻疹27D3株,间隔3周先后感染同一批人胚肺二倍体细胞2BS株,待两种病毒同时达到增殖高峰期时收获病毒液（以下简称HAM）,并分别进行病毒滴定、特异性检查、猴体安全性和免疫效果试验。