The science of sewage surveillance could be deployed in countries across the world to help monitor the spread of national epidemics of COVID-19 while reducing the need for mass testing, scientists say.

Experts in the field — known as wastewater epidemiology — say that as countries begin to ease pandemic lockdown restrictions, searching sewage for signs of the SARS-CoV-2 coronavirus could help them monitor and respond to flare-ups.

Small early studies conducted by scientific teams in The Netherlands, France, Australia and elsewhere have found signs that the COVID-19-causing virus can be detected in sewage.