感染和暴露无辜个体的免疫记忆在SARS-CoV-2疫苗接种后的一年
Priti Das1, Chakrakodi N Varun1, M A Ashwini1
1Department of Neurovirology, National Institute of Mental Health and Neurosciences (NIMHANS), Bengaluru, India.
The Indian journal of medical research
|May 10, 2025
概括
接种COVISHIELD疫苗的免疫力会在一年内减弱,因此需要补充剂量. 混合免疫力,结合疫苗接种和先前感染,提供对COVID-19的优越保护.
科学领域:
- 免疫学 免疫学 免疫学
- 疫苗学 疫苗学 疫苗学
- 传染性疾病 传染性疾病
背景情况:
- COVID-19大流行对医疗保健和经济的全球影响.
- 疫苗诱导的免疫反应对于控制流行病至关重要.
- 了解疫苗在不同人群中的有效性和耐用性至关重要.
研究的目的:
- 评估COVISHIELD (ChAdOx1 nCoV-A) 疫苗在医疗保健工作者 (HCW) 的耐用性和有效性.
- 在一年内接种两剂COVISHIELD疫苗后,评估幽默和细胞介导免疫力.
- 为了比较HCW的免疫反应与不同的SARS-CoV-2暴露和抗体状态.
主要方法:
- 在接种两剂COVISHIELD疫苗的84名HCW的纵向研究中.
- 根据免疫前抗体状况和RT-PCR结果,分类为四组.
- 通过抗峰IgG水平和通过T细胞标记物和免疫表型的细胞介导免疫评估幽默免疫.
主要成果:
- 在一年内在所有参与者群体中观察到抗尖峰IgG水平的显著下降 (P<0.0001).
- 记忆B细胞的数量在一年内在所有组都显著下降.
- 在研究期间,没有发现非活化T细胞的显著减少.
- 暴露的参与者 (A,B,C组) 的平均抗尖峰IgG水平明显高于未暴露的参与者 (D组) (P<0.0001).
结论:
- 由于COVISHIELD疫苗的免疫力下降,因此需要定期进行补充疫苗接种.
- 由于接种疫苗和先前感染而产生的混合免疫力,与单独接种疫苗相比,提供了更强的保护.
- 长期监测疫苗诱导的免疫力对于有效的COVID-19流行病管理至关重要.
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