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. 2021 Jan 16;210(1):65–72. doi: 10.1007/s00430-020-00698-8

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© The Author(s) 2021

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Fig. 2 — Distribution of Ct/Cp values in SARS-CoV-2 RT-PCR reactions from respiratory samples taken at primary COVID-19 diagnosis at site 1. Each bar indicates the number of respiratory samples ± 1 Ct/Cp value around the Ct/Cp value given on the x-axis. The red line depicts the median of these 193 specimen