Mircea T. Sofonea, Bénédicte Roquebert, Vincent Foulongne, David Morquin, Laura Verdurme, Sabine Trombert-Paolantoni, Mathilde Roussel, Jean-Christophe Bonetti, Judith Zerah, Stéphanie Haim-Boukobza, and Samuel Alizon
Figure 6. Ct values from the SARS-CoV-2 variant-specific screening quantitative PCR tests (N = 136,636), France, December 6, 2021–February 28, 2022. Ct values refer to the control (nucleoprotein) gene (A and D), 417N mutation (B), and 452R mutation (C). Values are shown as a function of the test outcome (A, B, and C) or the virus lineage (D). P values derived from a t-test where the reference variable is either A0B9C0D1 or BA.1. Boxes within violin plots show the median (horizontal line within box), 50% (box tops and bottoms), and 95% CIs (error bars). Tests were the same as in Figure 3, but only screening tests with Ct <28 were included to ensure robust screening results. Ct, cycle threshold; N, nucleoprotein gene.