Abstract
The ongoing pandemic of Coronavirus disease 19 (COVID-19) is caused by a newly discovered β Coronavirus named severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). How long the adaptive immunity triggered by SARS-CoV-2 can last is of critical clinical relevance in assessing the probability of second infection and efficacy of vaccination. Here we examined, using ELISA, the IgG antibodies in serum specimens collected from 17 COVID-19 patients at 6–7 months after diagnosis and the results were compared to those from cases investigated 2 weeks to 2 months post-infection. All samples were positive for IgGs against the S- and N-proteins of SARS-CoV-2. Notably, 14 samples available at 6–7 months post-infection all showed significant neutralizing activities in a pseudovirus assay, with no difference in blocking the cell-entry of the 614D and 614G variants of SARS-CoV-2. Furthermore, in 10 blood samples from cases at 6–7 months post-infection used for memory T-cell tests, we found that interferon γ-producing CD4+ and CD8+ cells were increased upon SARS-CoV-2 antigen stimulation. Together, these results indicate that durable anti-SARS-CoV-2 immunity is common in convalescent population, and vaccines developed from 614D variant may offer protection from the currently predominant 614D variant of SARS-CoV-2.
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Acknowledgements
This work was supported by grant from Double First-Class Project (No. WF510162602) from the Ministry of Education, State Key Laboratory of Medical Genomics, Overseas Expertise Introduction Project for Discipline Innovation (111 Project, No. B17029) and National Key R&D Program of China (No. 2019YFA0905902), the Shanghai Guangci Translational Medical Research Development Foundation.
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Yun Tan, Feng Liu, Xiaoguang Xu, Yun Ling, Weijin Huang, Zhaoqin Zhu, Mingquan Guo, Yixiao Lin, Ziyu Fu, Dongguo Liang, Tengfei Zhang, Jian Fan, Miao Xu, Hongzhou Lu, and Saijuan Chen declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article. All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2000 (5). Informed consent was obtained from all patients for being included in the study.
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Tan, Y., Liu, F., Xu, X. et al. Durability of neutralizing antibodies and T-cell response post SARS-CoV-2 infection. Front. Med. 14, 746–751 (2020). https://doi.org/10.1007/s11684-020-0822-5
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DOI: https://doi.org/10.1007/s11684-020-0822-5