Fig. 2. Di erent RT-PCR kits showed variations in detection rate and Ct values. RNA isolated from stored SARS-CoV-2-positive clinical samples using the MagNA Pure 96 DNA and Viral NA Small Volume Kit (Roche) was subjected to the various RT-PCR assays according to the manufacturer’s instructions for use, on a LightCycler 480 II (Roche). A) Graph depicts Ct values obtained for all clinical samples (n = 13) in all RT-PCR assays. Data points above the horizontal dotted line are negative, for plotting purposes indicated with Ct 42.5. The detection rate of the complete RT-PCR kit is indicated below the data points, e.g. 10/13 means 10 out of 13 samples tested positive according to the instructions for data interpretation provided by the manufacturer. For the Seegene kit, one sample was “inconclusive” according to the manufacturer’s guide for interpretation and was therefore counted as “negative”, although a signal was observed for at least one target.