FIGURE 4.

Colorimetric RT-LAMP for SARS-CoV-2 RNA detection. (A) Box-and-whisker representation of colorimetric RT-LAMP SARS-CoV-2–positive and –negative output (x axis) plotted in function of their respective RT-PCR Ct values (y axis). Forty-eight false negative samples were detected on RT-LAMP after Ct 32 despite other 55 being positive from Cts ranging from 32 to 39. (B) Receiver operating characteristic (ROC) curve constructed based on data presented in A. As summarized in Table 1, high-sensitivity values were obtained at the predicted cutoff.