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Detection of SARS-CoV-2 N antigen in nasopharyngeal swab and saliva specimens. N antigen-positive specimens are shown as solid circles; negative specimens are shown as open circles. Crosses indicate specimens that were not assayed by the antigen test. There were 4.525 in antigen-positive and 3.444 and log10 mean RNA copies/mL antigen-negative specimens were, and the difference was not significant (p = 0.1088, t-test).
