Fig. 3
From: Resource-efficient internally controlled in-house real-time PCR detection of SARS-CoV-2
Correlation between the internal KoMa control and SARS-CoV-2 genome load in clinical specimens. For the 424 SARS-CoV-2-positive specimens the CT values were grouped as indicated and plotted against the CT value for the inhibition control KoMa. While in specimens that are highly positive for SARS-CoV-2 KoMa does not give a signal reliably, in specimens with genome loads close to the detection limit as well as in negative samples, KoMa is constantly amplified, showing the efficiency of the nucleic acid extraction and possible inhibitory effects of the sample matrix. Detectability increases significantly with E-Gene CT values higher than 25 (Mann Whitney p < 0.0001)