The Ontario government is shutting down the wastewater surveillance program that has provided early warning for incoming waves of COVID-19 and a growing list of other infectious diseases since it was developed.

By the time it ends on July 31, the program that got its start in Ottawa early in the pandemic will be one of the biggest in the world to monitor the spread of infectious diseases through wastewater. Researchers were told of the decision to end funding last week.

Its closure comes at a time when COVID-19 is again beginning to spread through the world after a lull and when the United States and other countries are ramping up wastewater surveillance programs to warn about the possible spread of H5N1 avian influenza.