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. 2021 Aug 4;203:111839. doi: 10.1016/j.envres.2021.111839

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Fig. 4 — Presence and transmission risks of SARS-CoV-2 in wastewater system. Green and orange dots labeled with ‘P’ are for confirmed presence and potential presence, respectively. The transmission risk of SARS-CoV-2 to human is marked with green and orange dots labeled with ‘T’, for confirmed transmission and potential transmission from wastewater, respectively.(For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)