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. 2022 Jul 29;848:157707. doi: 10.1016/j.scitotenv.2022.157707

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Fig. 6 — Evolution of SARS-CoV-2 concentration (C_CoV) in the Arenales River at two sampling points: AR-1 and AR-2 before and after the southern wastewater treatment plant, respectively, and of the number of COVID-19 active cases accumulated for 14 days before sampling. LOD: limit of detection for SARS-CoV-2 in surface water. Non-detects were arbitrarily represented as LOD/2.