Fig. 4From: Comparison of the performance of two real-time fluorescent quantitative PCR kits for the detection of SARS-CoV-2 nucleic acid: a study based on large real clinical samplesFalse positive and cut-off value analysis of Maccura kit. A The test results of the Sansure kit when 1399 patients had different test results of the Maccura kit. B Ct values were obtained with the Maccura kit in case of positive and negative COVID-19. C ROC curve. Ct: Cycle threshold. *P < 0.05Back to article page