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Wastewater sampling in Canada suggests COVID case rate 19 times higher than reported

At the peak of a SARS-CoV-2 Omicron variant wave in Ontario, wastewater sampling conducted before the surge suggested that COVID-19 cases were 19 times higher than reported because of changes in clinical testing.

Cheng L, Dhiyebi HA, Varia M, et al. Omicron COVID-19 Case Estimates Based on Previous SARS-CoV-2 Wastewater Load, Regional Municipality of Peel, Ontario, Canada. Emerging Infectious Diseases. 2023;29(8):1580-1588. DOI: 10.3201/eid2908.221580.