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Background: The relationship between SARS-CoV-2-carrying time and specific antibody production has not yet been reported in re-admitted COVID-19 patients. We reported a case of mild COVID-19 with long virus-carrying time, weak production of virus-specific IgG and IgM antibodies, and recurrence of positive SARS-CoV-2 RNA in stool specimens after discharge. Case Presentation: A 27-year-old male was diagnosed as COVID-19 after returning to Meizhou from Wuhan. Despite extremely mild symptoms, the patient was hospitalized for 24 days because of persistent positive SARS-CoV-2 RNA detection. Three days after recovery discharge, he was hospitalized again for 7 days due to a recurrence of the positive SARS-CoV-2 RNA result, while in a good physical condition. Serological assay, using a fluorescent immunochromatography detection kit specific to SARS-CoV-2, showed that SARS-CoV-2-specific IgM antibodies were undetectable and IgG antibodies were very low on day 8 after onset; both of the antibodies seemingly reached top concentrations on day 15 (just a 6-fold increase of the IgG titer), and then decreased, remaining relatively stable from day 25 after onset until discharge. The production of the IgM and IgG targeting SARS-CoV-2 in this very mild case was much lower than that in a severe case of COVID-19 during the same hospitalizing period, and the latter was used as a control. Conclusion: Mild COVID-19 patients could carry SARS-CoV-2 for a long time, which may be related to the weak production of the virus-specific IgG and IgM. Recurrence of positive SARS-CoV-2 RNA could occur in mild COVID-19 possibly due to intermittent virus shedding, so strict quarantine and health surveillance should be taken for all discharged COVID-19 patients to prevent a potential virus spread.
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document_parses/pdf_json/42f049b04553591d4019aa2aa9176e71b0658797.json
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document_parses/pmc_json/PMC7426437.xml.json
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Longer Duration of SARS-CoV-2 Infection in a Case of Mild COVID-19 With Weak Production of the Specific IgM and IgG Antibodies
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