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Re-positive of SARS-CoV-2 test is common in COVID-19 patients after hospital discharge Data from high standard post-discharge quarantined patients in Macao SAR, China #MMPMID33981492
Wong CL; Lei SK; Lei CI; Lo IL; Lam C; Leong IH
PeerJ 2021[]; 9 (ä): e11170 PMID33981492show ga
During the pandemic of COVID-19, Macau faces tremendous pressure because it is a famous gambling and tourism city with the world's highest population density. The Macau government implemented decisive public health intervention to control the transmission of COVID-19, and there were only two independent outbreaks in Macau. In the second outbreak, all 35 cases were infected in foreign countries. They were quarantined in airborne infection isolation rooms for at least 14 days with reverse transcription-polymerase chain reaction (RT-PCR) tests after hospital discharge. Twelve (34.3%) of them had re-positive SARS-CoV-2 test results, and none of them presented any COVID-19 signs or symptoms during the entire quarantine period. In this study, the re-positive patients were more likely to be diagnosed in the early stage of the disease with a longer hospital stay. Virus re-infection is impossible in this high standard isolation setting, and reactivation is also unlikely, so that residual virus nucleic acid should be the possible reason for this phenomenon. Due to limited data about the risk of re-positive patients, it is better to quarantine patients after discharge for a prolonged period with repeat RT-PCR tests to minimize the community's potential risk, particularly in the regions with relative plenty of resources and low community infection rate such as Macau.