一项为期20个月的纵向研究,用于评估COVID-19疫苗接种后的幽默和细胞免疫力
Wlademir Braga Salgado Sobrinho1,2, Bárbara Batista Salgado1,2, Aguyda Rayany Cavalcante Barbosa1
1Universidade Federal do Amazonas, Programa de Pós-Graduação em Imunologia Básica e Aplicada, Laboratório de Doenças Infecciosas e Imunologia, Manaus, AM, Brasil.
Memorias do Instituto Oswaldo Cruz
|July 23, 2025
概括
随着时间的推移,COVID-19疫苗的免疫力会减弱. 瑞的助推剂维持了六个月的抗体水平,但在Sinovac接种者中,细胞免疫力显著下降,这凸显了定制增强策略的必要性.
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:
- 确立了COVID-19疫苗的有效性,但长期免疫耐用性需要进一步调查.
- 了解不同疫苗平台的免疫反应对于优化疫苗接种策略至关重要.
研究的目的:
- 在初级Sinovac-CoronaVac或AstraZeneca-Oxford疫苗接种后进行纵向比较,然后接种Pfizer增强剂后进行幽默和细胞免疫反应.
- 评估疫苗诱导的免疫力对SARS-CoV-2的持久性.
主要方法:
- 一项纵向研究比较了两个组:Sinovac-CoronaVac,其次是Pfizer (G1) 和AstraZeneca-Oxford,其次是Pfizer (G2).
- 在接种疫苗后的五个时间点测量免疫反应 (抗尖端IgG,IFNγ产生细胞).
- 使用了酶相关的免疫吸收试验 (ELISA) 和酶相关的免疫吸收点试验 (ELISPOT).
主要成果:
- 辛诺瓦克诱导的初始抗抗体IgG比AstraZeneca更低,但在第二剂量后水平相等.
- 在两组中,抗尖峰IgG在Pfizer助推剂后长达六个月保持升高.
- 细胞免疫力 (IFNγ产生细胞) 在Sinovac + Pfizer组显著下降,到研究结束时超过50%的非响应者.
结论:
- 在同源和异源疫苗接种后至少六个月保持高抗体水平.
- 在接受Sinovac接种后接种Pfizer增强剂的个体中,细胞免疫力下降的速度更快.
- 量身定制的增强剂策略对于维持长期的防护免疫力对抗COVID-19至关重要.
相关概念视频
01:36Humoral Immune Responses
76.4K
Overview
76.4K
01:23Immunological Memory
5.4K
Immunological memory, a pivotal pillar of the adaptive immune system, is responsible for the body's ability to remember and respond more swiftly and effectively to previously encountered pathogens. This remarkable feature is what makes vaccines so effective in preventing diseases.
What is Immunological Memory?
Immunological memory is an integral function of the immune system that allows it to recognize and react more rapidly and effectively to pathogens previously encountered. This feature...
What is Immunological Memory?
Immunological memory is an integral function of the immune system that allows it to recognize and react more rapidly and effectively to pathogens previously encountered. This feature...
5.4K
01:51Vaccinations
45.3K
Overview
45.3K
01:29Immune Response Against Viral Pathogens
928
The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
928
01:22Development of Immunocompetence
451
The initiation of cell-mediated immunity can be observed as early as the third month of fetal growth, with active antibody-mediated immunity following approximately one month later.
The initial cells that migrate from the fetal thymus settle within the skin and epithelial tissues lining the mouth, digestive tract, and in females, the uterus and vagina. These cells, including skin-based dendritic cells, serve as antigen-presenting cells, playing a key role in T cell activation.
Subsequent T...
The initial cells that migrate from the fetal thymus settle within the skin and epithelial tissues lining the mouth, digestive tract, and in females, the uterus and vagina. These cells, including skin-based dendritic cells, serve as antigen-presenting cells, playing a key role in T cell activation.
Subsequent T...
451
01:40Cell-mediated Immune Responses
73.1K
Overview
73.1K