Cellular Immunity in COVID-19 Convalescents with PCR-Confirmed Infection but with Undetectable SARS-CoV-2–Specific IgG

Cellular Immunity in COVID-19 Convalescents with PCR-Confirmed Infection but with Undetectable SARS-CoV-2–Specific IgG
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DOI:
10.3201/eid2701.203772
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发表时间:
2021-01
影响因子:
11.8
通讯作者:
Lindemann M
Lindemann M
中科院分区:
医学2区
文献类型:
--
作者:
Schwarzkopf S;Krawczyk A;Knop D;Klump H;Heinold A;Heinemann FM;Thümmler L;Temme C;Breyer M;Witzke O;Dittmer U;Lenz V;Horn PA;Lindemann M

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我们调查了德国一组经过PCR证实的SARS-CoV-2感染的康复期潜在献血者对SARS-CoV-2的免疫应答。在症状发作后60天,13/78(17%)的研究参与者对ELISA检测SARS-CoV-2的S1蛋白IgG的结果为临界或阴性。我们分析了PCR确认感染的参与者,他们有强烈的抗体反应(比率>3)作为阳性对照,没有SARS-CoV-2感染症状的参与者作为阴性对照,没有与感染患者的家庭接触。使用干扰素-γ ELISpot,我们观察到78%的PCR阳性志愿者(未检测到抗体)显示出对SARS-CoV-2的T细胞免疫。我们观察到一个类似的频率(80%)的T细胞免疫的恢复期捐助者与强抗体反应,但没有检测到免疫阴性对照。我们的结论是,在恢复期患者检测不到SARS-CoV-2 IgG,免疫可能是通过T细胞介导。
We investigated immune responses against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) among a group of convalescent, potential blood donors in Germany who had PCR-confirmed SARS-CoV-2 infection. Sixty days after onset of symptoms, 13/78 (17%) study participants had borderline or negative results to an ELISA detecting IgG against the S1 protein of SARS-CoV-2. We analyzed participants with PCR-confirmed infection who had strong antibody responses (ratio >3) as positive controls and participants without symptoms of SARS-CoV-2 infection and without household contact with infected patients as negative controls. Using interferon-γ ELISpot, we observed that 78% of PCR-positive volunteers with undetectable antibodies showed T cell immunity against SARS-CoV-2. We observed a similar frequency (80%) of T-cell immunity in convalescent donors with strong antibody responses but did not detect immunity in negative controls. We concluded that, in convalescent patients with undetectable SARS-CoV-2 IgG, immunity may be mediated through T cells.
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