Epidemiological characteristics of recovered COVID-19 cases with re-positive nucleic acid in Pudong New Area of Shanghai from May to June 2022
[Objective]To understand the epidemiological characteristics of recovered COVID-19 cases with re-positive nucleic acid in Pudong New Area of Shanghai,and to provide a reference for the prevention and control of COVID-19.[Methods]A three-month health follow-up and nucleic acid testing were conducted on 339 COVID-19 cases cured and discharged between May 20 and June 20,2022,in Pudong New Area,Shanghai,to analyze their epidemiological characteristics.[Results]Among the 339 follow-up cases,75 cases experienced re-positive nucleic acid results,with a recurrence rate of 22.12%.Factors such as gender,age group,occupation,presence of heart disease,hypertension,and full vaccination status had no effect on the re-positive results.Being diagnosed as a confirmed case during the first presence of infection,having diabetes,and a hospitalization period of≤7 days were related factors for recurrence.The median interval between discharge and re-positive nucleic acid results was 26 days.The close contacts of the re-positive cases did not contract COVID-19 after the isolation and observation period.[Conclusion]There is a possibility of re-positive nucleic acid results after COVID-19 recovery and discharge.Cases initially diagnosed as confirmed cases and those with a hospitalization period of no more than 7 days have a high rate of re-positivity.No secondary transmission is observed from the re-positive cases.
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