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 …

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 …

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 …

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 …

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 …

The permanence of rt-PCR positivity after a long time in COVID-19 patients has prompted
the question of whether SARS-CoV-2 could cause a persistent infection or patients can …

Reports of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) reinfection have
raised important questions about the strength and durability of the immune response to …

COVID-19 immunity in infected individuals may not be persistent. The specific response
wanes in patients who have recovered from this infection. Nevertheless, it has not been fully …

In March 2020, mild signs and symptoms of coronavirus disease developed in a healthy 33-
year-old man in Hong Kong. His first infection did not produce virus neutralizing antibodies …

As the pandemic continues, individuals with re-detectable positive (RP) SARS-CoV-2 viral
RNA among recovered COVID-19 patients have raised public health concerns. It is …