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RT-PCR cycle thresholds (Ct) (A) and SARS-CoV-2 RNA load (B) in asymptomatic close contacts of COVID-19 patients testing either positive or negative by Panbio™ COVID-19 Ag Rapid Test Device (RAD). The AMPLIRUN® TOTAL SARS-CoV-2 Control (Vircell S.A., Granada, Spain) was used as the reference material for SARS-CoV-2 RNA load quantitation (in copies/mL, considering RT-PCR Cts for the N gene). p Values for comparisons are shown.
