国产血源乙肝疫苗免疫效果及保护持久性研究

１９９０年１０月至１９９３年５月以随机、双盲和安慰剂对照的实验设计，在西安市某军校３００名ＨＢＶ血清学指标均阴性的大学生中，对国产５个生物制品研究所的乙型肝炎血源疫苗作了免疫效果及保护持久性研究。按０、１、６方案在人群中免疫之后，定期采血观察抗－ＨＢｓ动态并对各组人员进行随访观察发病情况。结果表明５个生物制品研究所的乙肝疫苗在抗－ＨＢｓ出现的时间，滴度、下降等方面均无显著差异。抗－ＨＢｓ峰值均在首次免疫后１２个月，到２４个月时阳性率下降约１０％，而滴度下降８０％．５组乙肝疫苗总保护率为７９．２２％。

Evaluation on Efficacy of plasma-derived Hepatitis B Vaccine and persistence of protective level after Vaccination

From October 1990 to May 1993, 300 students aged 18 to 20 years in VI xian were studied to evaluate the efficacy of plasma-derived hepatitis B vaccine made in five facedtories. AntiHBs titer in 5 vaccinated groups reach the highest at the tuelfth month after the first injection and decreased afterwards. The positive rate of anti-HBs decreased slowly, but the titer of anti-HBs fell sharply. Compared with the control group, the differences were all significant. The results showed that the efficacies of hepatitis B vaccine made in five factories were similar. The protection rate of hepatitis B vaccine against HBV infection was 79.22%.