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. 2020 Oct 19;764:142929. doi: 10.1016/j.scitotenv.2020.142929

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Fig. 3 — Concentration profile of SARS-CoV-2 viral load in 11 WWTPs' influents in the UAE. X-axis: mm/dd/yy, y-axis: viral concentration (gene copies/L). ND – indicates a sample where no value could be determined because it is below the detection limit.