婴儿用低剂量黄热病疫苗接种:随机,双盲,非劣势试验
Derick Kimathi1, Aitana Juan-Giner2, Ndeye S Bob3
1Kenya Medical Research Institute-Wellcome Trust Research Programme, Kilifi, Kenya.
Lancet (London, England)
|January 16, 2026
概括
在婴儿中,小剂量500 IU黄热病疫苗的效果并不低于标准剂量. 建议在常规免疫计划中为婴儿使用标准的黄热病疫苗剂量.
科学领域:
- 免疫学
- 疫苗学
- 儿童传染病
背景情况:
- 世界卫生组织 (WHO) 建议在疫情爆发期间分量接种黄热病疫苗,以节约供应.
- 虽然500 IU剂量对成年人有效,但对儿童的有效性尚不清楚.
- 确定婴儿的最低有效剂量对于公共卫生策略至关重要.
研究的目的:
- 与婴儿标准剂量相比,评估500 IU小剂量黄热病疫苗的非劣势性.
- 评估幼儿不同剂量黄热病疫苗的血清转化率和安全性.
- 为儿童群体提供黄热病疫苗的最佳剂量策略.
主要方法:
- 在肯尼亚和乌干达进行了一项随机,双盲,非劣势试验,涉及420名9-12个月的婴儿.
- 参与者接受了标准剂量 (> 13,000 IU) 或500 IU的黄热病疫苗,与麻疹- 红疹疫苗同时使用.
- 在接种疫苗28天后,通过50%的斑块减少中和试验测量血清转化.
主要成果:
- 标准剂量的血清转化率在28天为99%,500IU剂量的血清转化率为93%.
- 血清转化率的差异 (- 6. 15个百分点) 不符合非劣质标准 (95% CI的下限为 - 10. 27至 - 2.02).
- 在这两组中,没有任何严重的不良事件被认为与接种疫苗有关.
结论:
- 与婴儿标准剂量相比,小剂量500 IU黄热病疫苗没有显示不劣质性.
- 对于黄热病疫苗接种的儿童群体,不能将剂量要求推广到成人群体.
- 在世卫组织扩大免疫计划中,建议为婴儿提供标准的黄热病疫苗剂量.
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