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. 2021 Oct 23;809:151169. doi: 10.1016/j.scitotenv.2021.151169

Fig. 2.

Fig. 2

Heat maps showing the (a) RT-qPCR cycle threshold values (Ct) of SARS-CoV-2 N1 gene (Ct < 38) in the wastewater influent samples from the seven sampling events conducted in the four large (L1 – L4), four medium (M1 – M4), and 11 small (S1 – S11) WWTPs with N2 gene positive detection (Ct < 40) marked by framing; (b) number of new COVID-19 cases reported daily in the districts serviced by the four large (AL1 – AL4), four medium (AM1 – AM4), and 11 small (AS1 – AS11) WWTPs. Dark cells indicate no sample collection.