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Virological Characterization of Roof-Harvested Rainwater of Densely Urbanized Low-Income Region

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Abstract

Roof-harvested rainwater (RHRW) is considered relatively clean water, even though the possible presence of pathogens in the water may pose human health risks. In this study, we investigated the occurrence of enteric viruses in the first flush (10 mm) of RHRW from a densely populated and low-income urbanized region of Rio de Janeiro. One hundred samples (5 L) were collected from 10 rainfall events between April 2015 and March 2017. RNA and DNA viruses were concentrated using the skimmed milk flocculation method and analyzed using the TaqMan® quantitative RT-qPCR and qPCR. Human adenoviruses, noroviruses, rotaviruses A, and avian parvoviruses were detected in 54%, 31%, 12%, and 12% of the positive samples. JC polyomavirus, also targeted, was not detected. Virus concentrations ranged from 1.09 × 101 to 2.58 × 103 genome copies/Liter (GC/L). Partial nucleotide sequence confirmed the presence of HAdV type 41, norovirus genotype GII.4, and avian parvovirus 1. The results suggest that the first flush diversion devices may not adequately remove enteric virus from the rainwater. Additional treatment of RHRW is required to mitigate potential health risks from potable use of captured water.

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Acknowledgements

We would like to thank Mr. Roger DaSilva for helping with the English review. This research work is within the scope of the activities of FIOCRUZ as a collaborating center of PAHO/WHO of Public and Environmental Health.

Funding

Marize Pereira Miagostovich is a CNPq fellow and got funding from CNPq (National Council of Technological and Scientific Development); SVS—Ministry of Health n° 015/2015; and PAEF 2—Instituto Oswaldo Cruz.

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All authors critically revised the article for important intellectual content and approved all components of the final draft. TS contributed with performing, developing, and designing the sampling methodology, field data collection, visualization of data, and writing the original draft; FCF and MMAP performed the concentration processes of the samples; AM performed molecular techniques: TMF performed the sequencing analysis; ST, WA, and JS reviewed the manuscript and provide scientific insights; CdRVM reviewed the manuscript; MPM contributed with the supervision, project management and financing acquisition.

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Correspondence to Tatsuo Shubo.

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The authors declare that they do not have any conflict of interest related to this work.

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Shubo, T., Maranhão, A., Ferreira, F.C. et al. Virological Characterization of Roof-Harvested Rainwater of Densely Urbanized Low-Income Region. Food Environ Virol 13, 412–420 (2021). https://doi.org/10.1007/s12560-021-09484-y

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  • DOI: https://doi.org/10.1007/s12560-021-09484-y

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