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. 2021 May 12;2021:6651045. doi: 10.1155/2021/6651045

Figure 1.

Figure 1

Classification of the study subjects by different types of respiratory specimens. Upper (NPS/OPS) and lower (sputum) respiratory specimens of the study subjects were retested for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) using the Allplex 2019-nCoV assay. The study subjects (N = 342) were confirmed as positive for SARS-CoV-2 in both NPS/OPS and sputum at a rate of 45.3% (N = 155), SARS-CoV-2 positive in their NPS/OPS specimens but negative in their sputum at a 7.6% (N = 26) rate, and SARS-CoV-2 negative in their NPS/OPS specimens but positive in their sputum at a 3.5% (N = 12) rate. Some (43.6%, N = 149) were positive in NPS/OPS when sputum samples were not submitted. NPS: nasopharyngeal swab; OPS: oropharyngeal swab; NS: specimens were not submitted for COVID-19 (coronavirus disease 2019) testing; Pos: positive; Neg: negative.