Fig. 1. (A) Distribution of RdRp Ct values of all rRT-PCR tests performed on initial upper respiratory tract specimens obtained from newly diagnosed COVID-19 patients in Korea as of December 8, 2020. *Data were collected using the PowerChek 2019 nCoV (Kogene), Allplex 2019-nCoV (Seegene), Standard M nCoV (SD Biosensor), and Real-Q 2019-nCoV (Biosewoom) tests. (B) Clinical sensitivity of SQ-RAT compared with that of rRT-PCR by Ct stratum in specimens. The Ct data were collected using Standard M nCoV.
Abbreviations: COVID-19, coronavirus disease; Ct, threshold cycle; LoD, limit of detection; RdRp, RNA-dependent RNA polymerase gene; rRT-PCR, real-time reverse-transcription PCR; SQ-RAT, Standard Q COVID-19 rapid antigen test.

Ann Lab Med 2021;41:588~592 https://doi.org/10.3343/alm.2021.41.6.588