婴儿中MTBVAC的安全性,反应性和免疫性:在结核病特有环境中的2a期随机,双盲,剂量定义试验
Michele Tameris1, Virginie Rozot1, Claire Imbratta1
1South African Tuberculosis Vaccine Initiative (SATVI), Institute of Infectious Disease & Molecular Medicine and Division of Immunology, Department of Pathology, University of Cape Town, Cape Town, South Africa.
EBioMedicine
|March 18, 2025
概括
一种新的结核病 (TB) 疫苗,MTBVAC,在南非婴儿中证明了安全性和免疫性. 2.5 × 10 ^ 5 CFU 剂量耐受性良好,并且比目前的BCG疫苗更有效.
科学领域:
- 疫苗学 疫苗学 疫苗学
- 传染性疾病 传染性疾病
- 免疫学 免疫学 免疫学
背景情况:
- 结核病 (TB) 仍然是一个全球性卫生挑战,需要比目前的巴卡尔梅特·盖林 (BCG) 疫苗更安全,更有效的疫苗.
- 活衰减型Mycobacterium结核病 (Mtb) 候选疫苗MTBVAC提供了一个潜在的替代方案.
研究的目的:
- 在南非婴儿中,与BCG相比,对MTBVAC三种剂量水平的安全性,反应性和免疫性进行评估.
- 为了确定未来临床试验的最佳MTBVAC剂量.
主要方法:
- 一个随机试验,涉及健康的,从未接受过BCG的婴儿.
- 婴儿接受BCG或三种MTBVAC剂量中的一种 (2.5 × 10^4,2.5 × 10^5或2.5 × 10^6CFU).
- 通过不良事件 (AE) 和严重不良事件 (SAE) 评估安全性;通过干扰素-γ释放试验 (IGRA) 和细胞内细胞因子染色测量免疫性.
主要成果:
- 在所有测试剂量中,MTBVAC总体上是安全的,并且耐受良好.
- 与BCG相比,2.5 × 10^5 CFU的MTBVAC剂量显示出反应性降低.
- 在2.5 × 10^5和2.5 × 10^6 CFU剂量下,MTBVAC诱导了强大的T细胞免疫反应,比BCG具有更高的免疫性.
结论:
- MTBVAC 是一个有前途的结核病疫苗候选者,在婴儿中显示出有利的安全性和免疫性概况.
- 由于其安全性和免疫性之间的平衡,MTBVAC的2.5 × 10^5 CFU剂量被选择用于进一步开发.
- 这些发现支持将MTBVAC推进到预防结核病的第三阶段试验.
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