当前位置:首页>郑州>《STTT》郑州大学|衢州疾控中心报道老年人接种含XBB成分疫苗后中和抗体的持久性

《STTT》郑州大学|衢州疾控中心报道老年人接种含XBB成分疫苗后中和抗体的持久性

  • 2026-06-08 11:22:44
《STTT》郑州大学|衢州疾控中心报道老年人接种含XBB成分疫苗后中和抗体的持久性

COVID-19疫苗的持续效力,特别是针对快速演变的SARS-CoV-2变异株,是一个关键的公共卫生问题。这对于老年人群体尤为重要,该人群重症风险更高,且疫苗接种后免疫保护可能衰减更快。虽然含XBB成分的加强针疫苗是为了应对具有免疫逃逸能力的Omicron亚系而研发,但其在老年个体中引发的中和抗体(nAb)反应的持久性数据仍然有限。

109日,郑州大学Mai-Juan Ma、衢州疾控中心Bing-Dong Zhan、郑州大学Hai-Yan Yang通讯在《Signal transduction and targeted therapy》发表论文Neutralizing antibody durability and SARS-CoV-2 infection in older adults six months after XBB-containing vaccine booster”。。这项前瞻性队列研究提供了纵向观察结果,揭示了65岁以上老年人接种三种不同蛋白基含XBB成分疫苗作为加强针后,六个月内nAb反应的持久性以及SARS-CoV-2感染的发生情况。

该研究随访了90名此前曾接种一剂三价XBB.1.5Tri-XBB.15)、二价Omicron XBBBi-Omi-XBB)或四价XBB.1Tetra-XBB.1)疫苗作为加强针的老年人。研究重点分析了针对一组变异株(包括祖先株D614GBA.5XBB.1.5JN.1以及近期出现的KP.2KP.3KP.3.1.1XEC)的nAb滴度在接种后第2192185天的动力学变化。同时,详细记录了随访期间SARS-CoV-2感染的发生情况。

中和抗体动力学与持久性

分析显示,三种疫苗均在第21天时诱导了针对所有测试变异株的强劲nAb反应。然而,在六个月内观察到几何平均滴度(GMT)出现显著且进行性下降。到第185天时,与第21天的峰值相比,各队列的nAb滴度累积下降了2.54.6倍,其中对高度免疫逃逸的变异株KP.3.1.1XEC的下降最为明显。尽管存在这种衰减,在六个月时间点时,大多数参与者的nAb仍可检测到。对疫苗的比较评估表明,三价XBB.1.5疫苗表现出略优的抗体持久性,在整个研究期间,相较于二价和四价配方,其对变异株面板保持了相对更高和更广泛的交叉中和活性。

SARS-CoV-2感染与免疫反应的相关性

在六个月的随访期间,共有27名参与者(30%)发生了SARS-CoV-2感染。其中,11例通过快速抗原检测确认,16例根据nAb滴度显著升高的血清学证据归类为疑似感染。所有确认感染均为轻至中度,无需住院治疗,这凸显了疫苗在预防重症方面的有效性。与三价XBB.1.5疫苗的接种者相比,二价和四价XBB.1疫苗的接种者中感染比例较高,尽管该差异未达到统计学显著性。

感染发生的时间为突破性感染的决定因素提供了关键信息。分析显示,在早期(第2292天之间)发生感染的参与者,其第21天的峰值nAb滴度显著低于未感染参与者。这表明初始体液反应欠佳的个体更容易发生早期突破感染。相比之下,晚期感染(发生在第93185天)与较低的第21天滴度无关,而是与抗体水平随时间的自然衰减相关,凸显了免疫力下降在导致后期感染易感性中的作用。

感染对中和抗体谱的影响

SARS-CoV-2感染起到了免疫刺激的作用,短暂地提升了nAb水平。在早期感染的参与者中,与第21天的水平相比,在三个月时间点(第92天)观察到GMT1.53.9倍的升高。然而,这种提升未能持续,到六个月评估时(第185天)滴度已显著下降,回落至与感染前基线相当的水平。对于晚期感染者,第92天的nAb滴度反映了预期的衰减,但到第185天时出现了后续的1.34.6倍的升高,稳定在与初始峰值相似的水平。抗原图谱分析进一步证明,感染(尤其是在随访后期发生)能够拓宽中和反应,缩小了祖先病毒与新兴变异株(如JN.1KP系)之间的抗原距离。

结论与启示

这项纵向研究强调了管理老年人COVID-19面临的两个关键挑战:含XBB成分加强针接种后六个月内中和抗体的显著衰减,以及新出现的变异株(如KP.3.1.1XEC)带来的增强的免疫逃逸。研究结果表明,虽然这些蛋白基疫苗提供了预防重症的关键保护,但其预防感染的能力随时间推移而减弱。较低的峰值抗体与早期感染相关,以及抗体衰减与晚期感染相关,这强烈支持需要优化疫苗接种策略。这包括考虑为脆弱人群缩短加强针间隔时间(可能约为六个月),以及持续更新疫苗配方以在抗原上与流行变异株匹配。三价疫苗略优的表现也提示,疫苗成分(包括抗原剂量和价数)可能影响保护的持久性,值得在更大规模的研究中进一步探讨。

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  1. CONNECT:[ UseTime:0.000682s ] mysql:host=127.0.0.1;port=3306;dbname=i460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001262s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000625s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000508s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001278s ]
  6. SELECT * FROM `set` [ RunTime:0.000425s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001231s ]
  8. SELECT * FROM `article` WHERE `id` = 550959 LIMIT 1 [ RunTime:0.001488s ]
  9. UPDATE `article` SET `lasttime` = 1781222265 WHERE `id` = 550959 [ RunTime:0.002132s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000555s ]
  11. SELECT * FROM `article` WHERE `id` < 550959 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000775s ]
  12. SELECT * FROM `article` WHERE `id` > 550959 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000740s ]
  13. SELECT * FROM `article` WHERE `id` < 550959 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004308s ]
  14. SELECT * FROM `article` WHERE `id` < 550959 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004261s ]
  15. SELECT * FROM `article` WHERE `id` < 550959 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003963s ]
0.169372s