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Comparison analysis of six different swabs efficacy in detecting SARS-CoV-2 RNA at concentrations from 5.5 × 105 down to 5.5 × 10−4 PFU/ mL. Inactivation and RNA extraction of SARS-CoV-2 virus dilutions (pink) was used as a control. The dark line shows the expected average Cq based on the posterior median of the slope and intercept parameters. The transparent lines present 100 random draws from the posterior distribution, providing a visual estimate of the uncertainty around the mean.
