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Antigen testing procedure with the reference test (Standard Q®). (A) Fresh nasopharyngeal sample from a COVID-19 symptomatic patient received at the RAT laboratory. (B–C) A 350 µL volume of the sample is collected from the viral transport medium and (D) mixed with the extraction buffer, according to the manufacturer’s instructions. (E) Three drops of the extracted sample are applied to the testing device. (F) Results are readable in 15 to 30 min.
