References

1. World Health Organization. Rolling updates on coronavirus disease (COVID-19) 2020 [Available from: https://www.who.int/emergencies/diseases/novel-coronavirus-2019/events-as-they-happen.
2. Johns Hopkins University. COVID-19 Dashboard by the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University (JHU) 2020 [Available from: https://coronavirus.jhu.edu/map.html.
3. Grant MC, Geoghegan L, Arbyn M, Mohammed Z, McGuinness L, Clarke EL, et al. The prevalence of symptoms in 24,410 adults infected by the novel coronavirus (SARS-CoV-2; COVID-19): A systematic review and meta-analysis of 148 studies from 9 countries. PLoS One. 2020;15(6):e0234765.
4. García LF. Immune Response, Inflammation, and the Clinical Spectrum of COVID-19. Frontiers in Immunology. 2020;11(1441).
5. Mahmoodpoor A, Nader ND. Immune Responses to the Novel Coronavirus-2: Friend or Foe? Immunological Investigations. 2020:1-3.
6. Li G, Fan Y, Lai Y, Han T, Li Z, Zhou P, et al. Coronavirus infections and immune responses. Journal of Medical Virology. 2020;92(4):424-32.
7. Ou X, Liu Y, Lei X, Li P, Mi D, Ren L, et al. Characterization of spike glycoprotein of SARS-CoV-2 on virus entry and its immune cross-reactivity with SARS-CoV. Nature Communications. 2020;11(1):1620.
8. Tai W, He L, Zhang X, Pu J, Voronin D, Jiang S, et al. Characterization of the receptor-binding domain (RBD) of 2019 novel coronavirus: implication for development of RBD protein as a viral attachment inhibitor and vaccine. Cellular & Molecular Immunology. 2020;17(6):613-20.
9. Altmann DM, Boyton RJ. SARS-CoV-2 T cell immunity: Specificity, function, durability, and role in protection. Science Immunology. 2020;5(49):eabd6160.
10. Chu H, Chan JF-W, Wang Y, Yuen TT-T, Chai Y, Hou Y, et al. Comparative Replication and Immune Activation Profiles of SARS-CoV-2 and SARS-CoV in Human Lungs: An Ex Vivo Study With Implications for the Pathogenesis of COVID-19. Clinical Infectious Diseases. 2020.
11. Blanco-Melo D, Nilsson-Payant BE, Liu W-C, Uhl S, Hoagland D, Møller R, et al. Imbalanced Host Response to SARS-CoV-2 Drives Development of COVID-19. Cell. 2020;181(5):1036-45.e9.
12. Guillon A, Hiemstra PS, Si-Tahar M. Pulmonary immune responses against SARS-CoV-2 infection: harmful or not? Intensive Care Med. 2020:1-4.
13. Lingeswaran M, Goyal T, Ghosh R, Suri S, Mitra P, Misra S, et al. Inflammation, Immunity and Immunogenetics in COVID-19: A Narrative Review. Indian J Clin Biochem. 2020;35(3):260-73.
14. Shurin MR, Morris A, Wells A, Wheeler SE. Assessing Immune Response to SARS-CoV-2 Infection. Immunotargets Ther. 2020;9:111-4.
15. Lin Q, Zhu L, Ni Z, Meng H, You L. Duration of serum neutralizing antibodies for SARS-CoV-2: Lessons from SARS-CoV infection. J Microbiol Immunol Infect. 2020:S1684-182(20)30075-X.
16. Oberemok VV, Laikova KV, Yurchenko KA, Marochkin NA, Fomochkina II, Kubyshkin AV. SARS-CoV-2 will constantly sweep its tracks: a vaccine containing CpG motifs in ’lasso’ for the multi-faced virus. Inflamm Res. 2020:1-12.
17. Ng OW, Chia A, Tan AT, Jadi RS, Leong HN, Bertoletti A, et al. Memory T cell responses targeting the SARS coronavirus persist up to 11 years post-infection. Vaccine. 2016;34(17):2008-14.
18. Guo L, Ren L, Yang S, Xiao M, Chang D, Yang F, et al. Profiling Early Humoral Response to Diagnose Novel Coronavirus Disease (COVID-19). Clinical Infectious Diseases. 2020.
19. Theel ES, Slev P, Wheeler S, Couturier MR, Wong SJ, Kadkhoda K. The Role of Antibody Testing for SARS-CoV-2: Is There One? Journal of Clinical Microbiology. 2020;58(8):e00797-20.
20. Ni L, Ye F, Cheng M-L, Feng Y, Deng Y-Q, Zhao H, et al. Detection of SARS-CoV-2-specific humoral and cellular immunity in COVID-19 convalescent individuals. Immunity. 2020.
21. Le Bert N, Tan AT, Kunasegaran K, Tham CYL, Hafezi M, Chia A, et al. SARS-CoV-2-specific T cell immunity in cases of COVID-19 and SARS, and uninfected controls. Nature. 2020.
22. Wen W, Su W, Tang H, Le W, Zhang X, Zheng Y, et al. Immune cell profiling of COVID-19 patients in the recovery stageby single-cell sequencing. Cell Discovery. 2020;6(1):31.
23. Qin C, Zhou L, Hu Z, Zhang S, Yang S, Tao Y, et al. Dysregulation of Immune Response in Patients With Coronavirus 2019 (COVID-19) in Wuhan, China. Clinical Infectious Diseases. 2020.
24. Kumar S, Nyodu R, Maurya VK, Saxena SK. Host Immune Response and Immunobiology of Human SARS-CoV-2 Infection. Coronavirus Disease 2019 (COVID-19). 2020:43-53.
25. Yuan J, Kou S, Liang Y, Zeng J, Pan Y, Liu L. PCR Assays Turned Positive in 25 Discharged COVID-19 Patients. Clinical infectious diseases : an official publication of the Infectious Diseases Society of America. 2020.
26. Wong J, Koh WC, Momin RN, Alikhan MF, Fadillah N, Naing L. Probable causes and risk factors for positive SARS-CoV-2 test in recovered patients: Evidence from Brunei Darussalam. Journal of medical virology. 2020.
27. Qiao XM, Xu XF, Zi H, Liu GX, Li BH, Du X, et al. Re-positive Cases of Nucleic Acid Tests in Discharged Patients With COVID-19: A Follow-Up Study. Frontiers in Medicine. 2020;7.
28. Wise J. Covid-19: New coronavirus variant is identified in UK. BMJ. 2020;371:m4857.
29. Liang C, Cao J, Liu Z, Ge F, Cang J, Miao C, et al. Positive RT-PCR test results after consecutively negative results in patients with COVID-19. Infectious diseases (London, England). 2020;52(7):517-9.
30. Kang YJ. South Korea’s COVID-19 Infection Status: from the Perspective of Re-Positive after Viral Clearance by Negative Testing. Disaster medicine and public health preparedness. 2020:1-7.
31. Zhu H, Fu L, Jin Y, Shao J, Zhang S, Zheng N, et al. Clinical features of COVID-19 convalescent patients with re-positive nucleic acid detection. Journal of clinical laboratory analysis. 2020;34(7):e23392.
32. Wang X, Xu H, Jiang H, Wang L, Lu C, Wei X, et al. The Clinical Features and Outcomes of Discharged Coronavirus Disease 2019 Patients:A Prospective Cohort Study. QJM : monthly journal of the Association of Physicians. 2020.
33. Liu C, Ye L, Xia R, Zheng X, Yuan C, Wang Z, et al. Chest CT and Clinical Follow-up of Discharged Patients with COVID-19 in Wenzhou City, Zhejiang, China. Annals of the American Thoracic Society. 2020.
34. Wölfel R, Corman VM, Guggemos W, Seilmaier M, Zange S, Müller MA, et al. Virological assessment of hospitalized patients with COVID-2019. Nature. 2020;581(7809):465-9.
35. World Health Organization. Diagnostic testing for SARS-CoV-2 2020 [Available from: https://www.who.int/publications/i/item/diagnostic-testing-for-sars-cov-2.
36. Alcoba-Florez J, Gil-Campesino H, Artola DG-Md, González-Montelongo R, Valenzuela-Fernández A, Ciuffreda L, et al. Sensitivity of different RT-qPCR solutions for SARS-CoV-2 detection. International Journal of Infectious Diseases. 2020;99:190-2.
37. Li Y, Hu Y, Yu Y, Zhang X, Li B, Wu J, et al. Positive result of Sars-Cov-2 in faeces and sputum from discharged patient with COVID-19 in Yiwu, China. Journal of medical virology. 2020.
38. Chan JF-W, Yuan S, Kok K-H, To KK-W, Chu H, Yang J, et al. A familial cluster of pneumonia associated with the 2019 novel coronavirus indicating person-to-person transmission: a study of a family cluster. Lancet. 2020;395(10223):514-23.
39. Surkova E, Nikolayevskyy V, Drobniewski F. False-positive COVID-19 results: hidden problems and costs. Lancet Respir Med. 2020:S2213-600(20)30453-7.
40. Chen WJ, Yang JY, Lin JH, Fann CS, Osyetrov V, King CC, et al. Nasopharyngeal shedding of severe acute respiratory syndrome-associated coronavirus is associated with genetic polymorphisms. Clinical infectious diseases : an official publication of the Infectious Diseases Society of America. 2006;42(11):1561-9.
41. Ye G, Pan Z, Pan Y, Deng Q, Chen L, Li J, et al. Clinical characteristics of severe acute respiratory syndrome coronavirus 2 reactivation. J Infect. 2020;80(5):e14-e7.
42. Liu T, Wu S, Zeng G, Zhou F, Li Y, Guo F, et al. Recurrent positive SARS-CoV-2: Immune certificate may not be valid. Journal of medical virology. 2020.
43. Yao X-H, He Z-C, Li T-Y, Zhang H-R, Wang Y, Mou H, et al. Pathological evidence for residual SARS-CoV-2 in pulmonary tissues of a ready-for-discharge patient. Cell Research. 2020;30(6):541-3.
44. Yuan B, Liu HQ, Yang ZR, Chen YX, Liu ZY, Zhang K, et al. Recurrence of positive SARS-CoV-2 viral RNA in recovered COVID-19 patients during medical isolation observation. Scientific reports. 2020;10(1):11887.
45. Tillett RL, Sevinsky JR, Hartley PD, Kerwin H, Crawford N, Gorzalski A, et al. Genomic evidence for reinfection with SARS-CoV-2: a case study. The Lancet Infectious Diseases. 2020.
46. Wang P. Recurrent presence of SARS-CoV-2 RNA in a 33-year-old man. Journal of medical virology. 2020.
47. Lafaie L, Célarier T, Goethals L, Pozzetto B, Sylvain G, Ojardias E, et al. Recurrence or Relapse of COVID-19 in Older Patients: A Description of Three Cases. Journal of the American Geriatrics Society. 2020.
48. Batisse D, Benech N, Botelho-Nevers E, Bouiller K, Collarino R, Conrad A, et al. Clinical recurrences of COVID-19 symptoms after recovery: viral relapse, reinfection or inflammatory rebound? The Journal of infection. 2020.
49. Zhuang SF, Hu J, Qiao N, Lan ZH, Lai JY, Wu JG, et al. Low-grade fever during COVID-19 convalescence: A report of 3 cases. World journal of clinical cases. 2020;8(12):2655-61.
50. Liu F, Cai ZB, Huang JS, Yu WY, Niu HY, Zhang Y, et al. Positive SARS-CoV-2 RNA recurs repeatedly in a case recovered from COVID-19: dynamic results from 108 days of follow-up. Pathogens and disease. 2020;78(4).
51. Li XJ, Zhang ZW, Zong ZY. A case of a readmitted patient who recovered from COVID-19 in Chengdu, China. Crit Care. 2020;24(1).
52. Peng J, Wang M, Zhang G, Lu E. Seven discharged patients turning positive again for SARS-CoV-2 on quantitative RT-PCR. Am J Infect Control. 2020.
53. Loconsole D, Passerini F, Palmieri VO, Centrone F, Sallustio A, Pugliese S, et al. Recurrence of COVID-19 after recovery: a case report from Italy. Infection. 2020:1-3.
54. Zhou X, Zhou J, Zhao J. Recurrent pneumonia in a patient with new coronavirus infection after discharge from hospital for insufficient antibody production: A case report. BMC Infect Dis. 2020;20(1).
55. Duggan NM, Ludy SM, Shannon BC, Reisner AT, Wilcox SR. A case report of possible novel coronavirus 2019 reinfection. The American journal of emergency medicine. 2020.
56. Helleberg M, Niemann CU, Moestrup K, Kirk O, Lebech AM, Lane C, et al. Persistent COVID-19 in an Immunocompromised Patient Temporarily Responsive to Two Courses of Remdesivir Therapy. The Journal of infectious diseases. 2020.
57. Bongiovanni M, Basile F. Re-infection by COVID-19: a real threat for the future management of pandemia? Infectious diseases (London, England). 2020;52(8):581-2.
58. Cai S, Sun W, Li M, Dong L. A complex COVID-19 case with rheumatoid arthritis treated with tocilizumab. Clin Rheumatol. 2020.
59. Gomez-Mayordomo V, Montero-Escribano P, Matías-Guiu JA, González-García N, Porta-Etessam J, Matías-Guiu J. Clinical exacerbation of SARS-CoV2 infection after fingolimod withdrawal. Journal of medical virology. 2020.