肾综合征出血热疫苗接种后血清抗体水平变化

目的 观察肾综合征出血热疫苗在高发疫区大面积人群接种后的血清抗体水平变化,评价疫苗免疫效果。方法 以村为单位,１６～６０岁健康（删除既往患肾综合征出血热、外出〉９个月及疫苗禁忌证）为观察对象,按接种和对照各半的原则随机分组,接种组共１０４６０人,对照组１６１５９人。采用间接免疫荧光法测特异性ＩｇＧ荧光抗体,用微量细胞病变中和试验测中和抗体。结果 接种前血清抗体阴性全程接种后２周,荧光抗体阳转

The changes in serum antibody level after immunization with HFRS vaccine

OBJECTIVES: To observe the changes in serum antibody level after mass immunization with vaccine against hemorrhagic fever with renal syndrome (HFRS) and to evaluate its efficacy and effectiveness in the prevalent areas. METHODS: Healthy people aged 16 to 60 years in the villages were recruited as study subjects, excluding those suffered from HFRS previously, going out for more than nine months and those with contraindications, and were randomly allocated into immunization and control groups with 10,460 and 16,159 persons, respectively. Specific IgG antibody was determined with indirect immunofluorescent assay (IFA) and neutralizing antibody (NA) was determined with micro CPE method. RESULTS: Two weeks after the full-course immunization, sero-conversion rate for IFA reached 100% in those sero-negative before immunization, with a 95% confidence interval of 96.3 - 100.0%, and that for NA 44.4%, with a 95% CI of 22.0% - 69.0%. Geometric mean titer (GMT) were 72.1 and 4.6 for IFA and NA, respectively. Booster immunization was provided for them one year later. Positivity of IFA and NA was 28.6%, 83.3%, 75.0%, 53.1%, 22.6% and 14.8%, 55.6%, 35.0%, 31.3%, 26.0%, before booster immunization, two weeks, one year, one and a half years, two years after booster immunization, respectively. CONCLUSION: HFRS vaccine had good immunogenicity, but its duration of serum antibody sustenance was relatively short.