Viruses Survive in Fresh Water by 'Hitchhiking' on Plastic, Study Finds

Dangerous viruses can remain infectious for up to three days in fresh water by hitchhiking on plastic, researchers have found. From a report: Enteric viruses that cause diarrhoea and stomach upsets, such as rotavirus, were found to survive in water by attaching to microplastics, tiny particles less than 5mm long. They remain infectious, University of Stirling researchers found, posing a potential health risk. Prof Richard Quilliam, lead researcher on the project at Stirling University, said: "We found that viruses can attach to microplastics and that allows them to survive in the water for three days, possibly longer." While previous research had been carried out in sterile settings, this is the first research into how viruses behave in the environment, Quilliam said. However, he used standard laboratory methods to determine whether viruses found on microplastics in water were infectious. "We weren't sure how well viruses could survive by 'hitchhiking' on plastic in the environment, but they do survive and they do remain infectious," he said. The findings, part of a $2.27m project funded by the Natural Environment Research Council looking at how plastics transport bacteria and viruses, concluded that microplastics enabled pathogen transfer in the environment. The paper is published in the journal Environmental Pollution. "Being infectious in the environment for three days, that's long enough to get from the wastewater treatment works to the public beach," Quilliam said. Wastewater treatment plants were unable to capture microplastics, he said. "Even if a wastewater treatment plant is doing everything it can to clean sewage waste, the water discharged still has microplastics in it, which are then transported down the river, into the estuary and wind up on the beach."

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