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. 2021 Jan 5;191:116810. doi: 10.1016/j.watres.2021.116810

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Fig 4 — SARS-CoV-2 spread in different areas of Niterói according to wastewater treatment plants (WWTPs) and sewer points (SP) from neighbourhoods and slums. HDI: Human Development Index; Squares in white: without sample collection; Number of COVID-19 cases were provided by Health Secretariat.