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A Systematic Review on the Recurrence of Sars-Cov-2 Virus: Frequency, Risk Factors, and Possible Explanations Publisher Pubmed



Piri SM1 ; Edalatfar M1 ; Shool S2 ; Jalalian MN3 ; Tavakolpour S4, 5
Authors
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Authors Affiliations
  1. 1. Sina Trauma and Surgery Research Center, Tehran University of Medical Sciences, Tehran, Iran
  2. 2. Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
  3. 3. Faculty of Medicine, Tehran University of Medical Sciences, Tehran, Iran
  4. 4. Infectious Diseases and Tropical Medicine Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
  5. 5. Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA, United States

Source: Infectious Diseases Published:2021


Abstract

Background: Since late 2019, SARS-CoV-2 which leads to coronavirus disease 2019 (COVID-19), has caused thousands of deaths. There are some pieces of evidence that SARS-CoV-2 genome could be re-detectable in recovered patients. Methods: We performed a systematic review in the PubMed/Medline database to address the risk of SARS-CoV-2 recurrence. The last update was for 20 November 2020. Among the 1178 initially found articles, 66 met the inclusion criteria and were considered. Findings: In total, 1128 patients with at least one-time recurrence of SARS-CoV-2 were included. Recurrence rate has been reported between 2.3% and 21.4% in cohort studies, within a mean of 20 (ranged 1–98) days after discharge; younger patients are being affected more. Following the second course of disease, the disease severity decreased or remained unchanged in 97.3% while it increased in 2.6%. Anti-SARS-CoV-2 IgG and IgM were positive in 11–95% and 58.8–100%, respectively. Based on the literature, three possibilities include reactivation of previous disease, reinfection with the same virus, and false negative, which have been discussed in details. Conclusion: There is a relatively notable risk of disease recurrence in previously recovered patients, even those who are immunised against the virus. More studies are required to clarify the underlying cause of this phenomenon. © 2021 Society for Scandinavian Journal of Infectious Diseases.
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