Thank you. That's a great question.
The waste-water surveillance is an extremely helpful tool, especially when we don't have access to widespread community testing. It gives us an early signal as to where COVID-19 might be on the rise, or actually on the decline—although unfortunately we are seeing it on the rise in many jurisdictions. It's a way to look at early signals for COVID changes over time, plus tracking the geography of where those changes are occurring.
It's proven to be an extraordinarily helpful tool, not just here in Canada, but elsewhere in the world.