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. 2022 Feb 28;10(3):107488. doi: 10.1016/j.jece.2022.107488

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Fig. 4 — RT-LAMP time course measurements for sensing SARS-CoV-2 in wastewater samples. (a) Retrieved peak current change %ΔI_p for five concentrations L9–1 = 251.8, L9–2 = 25.18, L9–3 = 2.518, L9–4 = 0.02518 and L9–5 = 0.002518 × 10⁻³ ng/μL as a function of the reaction time. (b) Correlation between the time-to-threshold t_th and concentration c in a logarithmic scale.