Recurrent positive SARS-CoV-2 - immune certificate may not be valid.

Currently, coronavirus disease in 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)1 has become a global pandemic. The presence of SARS-CoV-2 in COVID-19 patients is usually confirmed using real-time reverse-transcriptase polymerase chain reaction (RT-PCR) method.2 This article is protected by copyright. All rights reserved.