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10.1016/j.ijid.2021.04.076

http://scihub22266oqcxt.onion/10.1016/j.ijid.2021.04.076
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suck abstract from ncbi


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pmid33930545      Int+J+Infect+Dis 2021 ; 107 (ä): 242-246
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  • Early and consecutive RT-PCR tests with both oropharyngeal swabs and sputum could improve testing yield for patients with COVID-19: An observation cohort study in China #MMPMID33930545
  • Song Y; Chen C; Wang Y; Zhang J; Chen M; Gao G; Wang S; Yang D; Song R; Wang L; Xie W; Yu F; Yan L; Wang Y; Zeng H; Zhang F
  • Int J Infect Dis 2021[Jun]; 107 (ä): 242-246 PMID33930545show ga
  • OBJECTIVE: The real-time polymerase chain reaction (RT-PCR) test is recommended for the diagnosis of COVID-19 and provides a powerful tool to identify new infections and facilitate contact tracing. In fact, as the prevalence of COVID-19 decreases, this RT-PCR testing remains as the main preventive measure to avoid rebound. However, inconsistent results can lead to misdiagnoses in the clinic. These inconsistencies are due to the variability in (1) the collection times of biological samples post infection, and (2) sampling procedures. METHODS: We applied the Kaplan-Meier method and multivariate logistic regression on RT-PCR results from 258 confirmed patients with COVID-19 to evaluate the factors associated with negative conversion. We also estimated the proportion (%) of negative conversion among patients who had tested twice or more, and compared the proportions arising from oropharyngeal swabs, sputum, and combined double testing, respectively. MAIN RESULTS: The proportion of negative conversion was 6.7% on day 4, 16.4% on day 7, 41.0% at 2 weeks, and 61.0% at 3 weeks post-admission. We also found that 34.1% and 60.3% of subjects had at least one negative RT-PCR result on days 7 and 14 after the onset of symptoms, respectively. The proportion of negative conversions following sputum testing was higher than that from oropharyngeal swabs in the early stages but this declined after the onset of symptoms. CONCLUSION: In the absence of effective treatments or vaccines, efficient testing strategies are critical if we are to control the COVID-19 epidemic. According to this study, early, consecutive and combined double testing, will be the key to identify infected patients, particularly for asymptomatic and mild symptomatic cases. These strategies will minimize misdiagnosis and the ineffective isolation of infected patients.
  • |Adolescent[MESH]
  • |Adult[MESH]
  • |Aged[MESH]
  • |Aged, 80 and over[MESH]
  • |COVID-19 Nucleic Acid Testing/*methods[MESH]
  • |COVID-19/*diagnosis[MESH]
  • |Cohort Studies[MESH]
  • |Female[MESH]
  • |Humans[MESH]
  • |Male[MESH]
  • |Middle Aged[MESH]
  • |Oropharynx/*virology[MESH]
  • |SARS-CoV-2/*isolation & purification[MESH]
  • |Sputum/*virology[MESH]


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