Researchers from Toyama Prefectural University, Kanazawa University and Kyoto University tested water at four treatment plants in western Japan and found seven of 27 samples positive for the virus, according to a preprint of the study.
"Sewage testing is used as an early warning system to alert people about (possibly unnoticed ongoing community transmission," Yuki Furuse, a Kyoto University professor who wasn't directly involved in the trial told Reuters.
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