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. 2020 May 10;181:115926. doi: 10.1016/j.watres.2020.115926

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© 2020 The Authors

Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

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Fig. 2 — Viral concentrations (mean, minimum and maximum values in genome copies (gc) or plaque-forming units (pfu) per litre) extracted from the reviewed studies. (A) All data; (B) Distribution of the data in A grouped by continent. AdV: human mastadenoviruses; PyV: human polyomavirus JC, BK and MC; AiV: human Aichi viruses; PMMoV: pepper mild mottle virus; crAssP: crAssphage; BacP: culturable phages infection Bacteriodes spp.; FRNAP: FRNA phages II and III; WW: wastewater.