id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-284464-avriske3	Liu, Tao	Recurrent positive SARS‐CoV‐2: Immune certificate may not be valid	2020-06-09		.txt	text/plain	295	32	58	key: cord-284464-avriske3 cord_uid: avriske3 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. Statistical analyses were conducted using SAS software version 9.4 (SAS Institute; Carey, NC). A two-sided P < .05 was considered statistically significant. Among 150 patients who were recovering from COVID-19, 11 (7.3%, 95% confidence interval: 3.1%-11.6%) tested positive again for SARS-CoV-2 in throat swabs. Positive rates for SARS-CoV-2 did not differ by sex or age. There were no differences in the prevalence of IgM or IgG to SARS-CoV-2 ( Figure S1 ) or serum levels of these antibodies (Table 1) Detection of SARS-CoV-2 in different types of clinical specimens Positive RT-PCR test results in patients recovered from COVID-19 Development and clinical application of a rapid IgM-IgG combined antibody test for SARS-CoV-2 infection diagnosis	./cache/cord-284464-avriske3.txt	./txt/cord-284464-avriske3.txt