埃塞俄比亚中部的罗塔病毒A基因型多样性和抗原特征:对rotarix®疫苗有效性的影响
Yisehak Tsegaye Redda1,2,3, Haileeyesus Adamu1, Julia Bergholm2
1Biotechnology Research Center, Institute of Advanced Sciences and Technology, Addis Ababa University, Addis Ababa, Ethiopia.
Frontiers in microbiology
|October 23, 2025
概括
埃塞俄比亚儿童中的罗塔病毒A (RVA) 菌株显示出显著的遗传多样性,其中G9P[4]占主导地位. 循环RVA菌株的氨基酸变化可能会影响Rotarix疫苗的有效性,需要持续监测和疫苗更新.
科学领域:
- 病毒学 病毒学
- 免疫学 免疫学 免疫学
- 公共卫生 公共卫生
背景情况:
- 罗塔病毒A (RVA) 是全球儿童严重腹的主要原因,对公众健康构成重大挑战,特别是在埃塞俄比亚.
- 尽管引入了轮状病毒疫苗,但病毒突变和重组的高率导致了遗传多样性和潜在的疫苗逃脱,威胁到疾病控制工作.
研究的目的:
- 调查埃塞俄比亚中部在五岁以下腹儿童中传播的RVA菌株的遗传多样性和特征.
- 将这些循环RVA菌株的遗传构成与Rotarix®疫苗菌株进行比较,重点关注关键的抗原区域.
主要方法:
- 在Debre Berhan和亚的斯亚贝巴 (2022年4月 - 2023年12月) 收集了5岁以下腹儿童的便样本.
- 使用定量实时PCR (qPCR) 检测RVA,并通过VP7和VP4基因的桑格测序进行基因定型.
- 使用MEGA X进行了基因组学分析,并将氨基酸序列与Rotarix®疫苗菌株进行比较,以确定抗原位点中的替代物.
主要成果:
- 在12.14%的样本中检测到RVA,G9P[4]是最常见的基因型 (35%).
- 与Rotarix®疫苗菌株相比,在流通菌株的VP7和VP4基因中观察到显著的氨基酸替代.
- 遗传学分析表明,已识别的RVA菌株与之前报告的埃塞俄比亚菌株具有共同的进化起源.
结论:
- 由于G9P的占主导地位[4]以及与Rotarix®疫苗菌株的氨基酸差异较大,可能会降低其有效性.
- 持续的分子监测和疫苗疗效的评估至关重要.
- 未来的轮状病毒疫苗开发应该考虑更广泛的基因型覆盖,以应对新兴菌株.
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