We performed a prospective study of 501 patients, regardless of symptoms, admitted to the hospital, to estimate the predictive value of a negative nasopharyngeal swab for severe acute respiratory coronavirus virus 2 (SARS-CoV-2). At a positivity rate of 10.2%, the estimated negative predictive value (NPV) was 97.2% and the NPV rose as prevalence decreased during the study.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7783084 | PMC |
| http://dx.doi.org/10.1017/ice.2020.1362 | DOI Listing |
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