Abstract
Waterborne exposure to human viruses is possible through contact with contaminated water environments and can result in infections associated with a wide range of illnesses, including gastrointestinal, respiratory, ear, ocular, and skin infections. Recently, the occurrence in water environments of two groups of human viruses—both known with oncogenic potential, human polyomaviruses (HPyVs) and papillomaviruses (HPVs)—has been reported worldwide. These viruses, responsible for highly prevalent infections worldwide, have recently been proposed as potentially emerging waterborne pathogens. The objective of the present study was to examine the occurrence of HPyVs and HPVs in surface waters, by monitoring two rivers in Northwestern Italy, by nested PCR assays and sequencing. HPyVs (JC, BK, and Merkel cell polyomavirus) were detected in 10/25 (40 %) samples. HPVs (HPV8, 17, 21, 25, 32, 80, 99, 105, and putative new HPVs) were identified in 14/25 (56 %) river samples. The number of HPV DNA copies in waters was measured by quantitative real-time PCR. To our knowledge, this is the first detection and quantification of HPVs in surface waters. The possibility that HPyVs and HPVs can be transmitted by the waterborne route deserves to be explored in future studies.

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Acknowledgments
We thank Professor Herbert W. Virgin, Washington University (St. Louis, Missouri, United States) for providing the murine norovirus strain used as sample process control.
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The authors declare that they have no conflict of interest.
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Iaconelli, M., Petricca, S., Libera, S.D. et al. First Detection of Human Papillomaviruses and Human Polyomaviruses in River Waters in Italy. Food Environ Virol 7, 309–315 (2015). https://doi.org/10.1007/s12560-015-9203-7
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DOI: https://doi.org/10.1007/s12560-015-9203-7