目的:探讨免疫前抗体滴度对流感疫苗免疫效果的影响,寻找流感免疫的敏感人群,为流感的预防接种提供科学依据。方法:采用重复整群随机抽样方法,采集常州、盐城、南京、淮安、宿迁、扬州六地区不同人群免疫前后血清,利用红细胞凝集抑制试验进行流感HI抗体检测,计算抗体阳转率。结果:甲1型(H1N1)、甲3型(H3N2)与乙型(B)流感HI抗体阳性率存在年龄差异,H3N2流感抗体阳转率婴幼儿组高于其他年龄组;而B型流感抗体阳转率为婴幼儿组低于其他年龄组。在达到保护水平的人群中,随着免疫前抗体滴度的增大,阳转率逐渐减小,用约登指数最大法确定H1N1、H3N2与B型流感抗体不能阳转时免疫前抗体的阈值分别为1 ∶ 160、1 ∶ 160和1 ∶ 80。结论:当H1N1、H3N2与B型免疫前抗体水平超过1 ∶ 160、1 ∶ 160和1 ∶ 80时,进行疫苗接种不能达到预期免疫效果。
Objective:To explore the effects of the prevaccination antibody titer on the positive rate of antibody,and to find the sensitive herd of influenza vaccination for providing the scientific basis for the flu prevention. Methods:Duplicates entire group random sampling method were used. The antibody was abstracted from natural populations in Changzhou,Yancheng,Nanjing,Huaian,Suqian and Yangzhou. The antibody of influenza was measured by the hemagglutination inhibition test and the positive rate of antibody. Results:The positive rate of subtype A3 and type B were different in ages. The positive rate of subtype A3 was higher in infant and pre-school children,while that of type B was lower than other years-old people. Along with the increasing of pre-immune antibody titer,the positive rate gradually reduced in the person who had protection from influenza. Youden’s index found that the threshold of subtype A1,subtype A3 and type B was 1 ∶ 160,1 ∶ 160 and 1 ∶ 80 respectively. Conclusion:When pre-immune antibody titer of subtype A1,subtype A3 and type B exceeded 1 ∶ 160,1 ∶ 160 and 1 ∶ 80,influenza vaccination couldn’t achieve the anticipated immune effect.
严〓睿,朱凤才.流感免疫前抗体水平对疫苗免疫效果的影响[J].南京医科大学学报(自然科学版),2008,28(3):364-367