Comparison of 12 Molecular Detection Assays for Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2).

Viral loads in nasopharyngeal swabs, which were presumed from the C T values of CDC N2 and NIID N2 assays, were higher in nasopharyngeal swabs (median [interquartile range], 27.1 [23.6 to 31.1] and 29.7 [26.3 to 33.3], respectively) than those in oropharyngeal swabs (31.5 [29.9 to 35.0] and 33.0 [32.0 to 34.6]) or sputum (30.0 [25.6 to 33.5] and 30.9 [28.3 to 34.0]), but the differences did not reach statistical significance ( P = 0.11 and 0.16 by comparison among 3 specimen types, respectively).

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