双对应的COVID-19 mRNA增强疫苗接种 (BA.1或BA.4/BA.5) 增加了匹配的Omicron变异的中和
David N Springer1, Michael Bauer1, Iris Medits1
1Center for Virology, Medical University of Vienna, Vienna, Austria.
NPJ vaccines
|August 4, 2023
概括
双对应的BA.4/BA.5增强剂和Omicron突破性感染显著增加了中和抗体标位. 然而,XBB.1.5变种表现出对当前疫苗和先前感染的免疫逃避.
科学领域:
- 免疫学 免疫学 免疫学
- 病毒学 病毒学
- 疫苗学 疫苗学 疫苗学
背景情况:
- SARS-CoV-2 Omicron 变种 (BA.1,BA.2,BA.4/BA.5) 的出现需要评估疫苗的有效性.
- 了解中和抗体反应对于对抗演变的SARS-CoV-2的公共卫生战略至关重要.
研究的目的:
- 为了比较不同疫苗接种和感染场景后的SARS-CoV-2中和抗体标位.
- 评估双价疫苗和Omicron突破性感染对抗体反应的影响.
- 为了评估与XBB.1.5变种的交叉中和能力.
主要方法:
- 分析了三次接种疫苗的个体的血清.
- 用原始单价,双价BA.1或双价BA.4/BA.5疫苗进行增强后测量了抗体标位.
- 在突破性感染 (BA.1,BA.2,BA.4/BA.5) 的个体中,也评估了抗体标位.
- 对各种SARS-CoV-2变种测量了中和抗体反应,包括XBB.1.5.5.
主要成果:
- 与单价BA.4/BA.5助推剂和Omicron突破性感染相比,双价BA.4/BA.5助推剂诱导了较高的Omicron中和标位,而不是单价助推剂.
- 突破性感染的个体表现出不同的中和抗体反应,取决于特定的Omicron变种.
- 该XBB.1.5变种表现出明显的逃避当前疫苗和先前感染引起的中和抗体.
结论:
- 双等效的BA.4/BA.5疫苗和Omicron突破性感染增强了对Omicron变体的中和抗体反应.
- 目前的疫苗和以前的感染对XBB.1.5变种提供了有限的保护.
- 需要进一步开发疫苗,以应对新出现的SARS-CoV-2变种 (如XBB.1.5.5) 的免疫逃避.
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