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. 2021 Jul 7;796:148887. doi: 10.1016/j.scitotenv.2021.148887

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Fig. 3 — SARS-CoV-2 detection and epidemiological data from the area served by El Paramillo (a–b) and Campo Espejo (c–d) WWTPs. Wastewater sample positivity for both genetic markers, N1 (green circles) and N2 (purple circles), which codify for the viral nucleocapsid of SARS-CoV-2 (a and c). Relationship between weekly COVID-19 cases and the number of SARS-CoV-2 genetic copies per 100 mL of wastewater (b and d).