在Omicron突破感染后,中和抗体反应的持久重编程
Wen Shi Lee1, Hyon-Xhi Tan1, Arnold Reynaldi2
1Department of Microbiology and Immunology, University of Melbourne, Peter Doherty Institute for Infection and Immunity, Melbourne, VIC, Australia.
Science advances
|July 21, 2023
概括
被感染Omicron变种 (BA.1或BA.2) 的接种疫苗的个体对类似株的免疫力有所增强,但对像XBB.这样的新变种的保护性降低. 记忆B细胞扩大,但新的抗体反应是有限的.
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:
- 严重急性呼吸道综合征冠状病毒2 (SARS-CoV-2) 突破性感染正在增加,原因是免疫逃避的Omicron变种.
- 了解这些感染对疫苗诱导的幽默免疫的影响,对于公共卫生战略至关重要.
研究的目的:
- 在Omicron BA.1或BA.2突破性感染后,研究尖端特异性幽默免疫的动态和持久性.
- 评估对各种SARS-CoV-2变体的中和范围,包括祖先和Omicron亚系.
主要方法:
- 在Omicron BA.1或BA.2突破性感染后8个月内,对接种疫苗的个体进行纵向采样.
- 对抗SARS-CoV-2变种的中和活性的测量.
- 对交叉反应性记忆B细胞反应和新的抗体生成的分析.
主要成果:
- 感染Omicron BA.1和BA.2显著提高了对感染菌株的中和性,并扩大了对BA.4.4的活性.
- 对像XBB和BQ.1.1.1.这样的新菌株而言,中和活性大大降低.
- 感染主要扩大了交叉反应性记忆B细胞,仅限于新型Omicron特异性B细胞或抗体的招募.
结论:
- 奥米克朗突破性感染增强幽默免疫力,提供对抗原相似菌株的持久保护.
- 新兴的SARS-CoV-2变种具有增强的中和逃脱特性,对疫苗诱导的保护构成重大威胁.
- 需要进一步的研究来了解长期免疫力和为疫苗更新提供信息.
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