参考资料:
[1] Braun, J., Loyal, L., Frentsch, M. et al. SARS-CoV-2-reactive T cells in healthy donors and patients with COVID-19. Nature (2020). https://doi.org/10.1038/s41586-020-2598-9
[2] Could prior exposure to common cold viruses affect the severity of SARS-CoV-2 symptoms? Retrieved July 29, 2020, from https://www.charite.de/en/service/press_reports/artikel/detail/could_prior_exposure_to_common_cold_viruses_affect_the_severity_of_sars_cov_2_symptoms/