Background Some COVID-19 cases test positive again for SARS-CoV-2 RNA following
negative test results and discharge, raising questions about the meaning of virus detection …

Background The characteristics, significance and potential cause of positive SARS-CoV-2
diagnoses in recovered coronavirus disease 2019 (COVID-19) patients post discharge (re …

Recently, the recurrence of positive SARS-CoV-2 viral RNA in recovered COVID-19 patients
is receiving more attention. Herein we report a cohort study on the follow-up of 182 …

Many studies have shown that re-positive tests for SARS-CoV-2 by RT-PCR in recovered
COVID-19 patients are very common. We aim to conduct this review to summarize the …

ABSTRACT SARS-CoV-2 reinfection rate is low. The relative severity of the first and second
episodes of infection remains poorly studied. In this study, we aimed at assessing the …

Effective strategy to mitigate the ongoing pandemic of 2019 novel coronavirus (COVID-19)
require a comprehensive understanding of humoral responses against severe acute …

Abstract Since December 2019, COVID-19, the clinical syndrome associated with SARS-
CoV-2 infection, has infected more than 6.2 million people and brought the function of the …

Background Waning immunity occurs in patients who have recovered from COVID-19.
However, it remains unclear whether true re-infection occurs. Methods Whole genome …

Abstract The coronavirus disease 2019 (COVID-19) outbreak started in December 2019 and
rapidly spread around the globe as a major health threat. Several reports on re-positive …

Objectives To estimate the burden and severity of suspected reinfection with severe acute
respiratory syndrome coronavirus 2 (SARS-CoV-2). Methods A retrospective cohort of …