Wastewater surveillance works because many infectious agents are excreted in bodily fluids, before and during active infection, says Lawrence Goodridge of the University of Guelph.

The facility was funded by Western's Schulich School of Medicine & Dentistry and a significant grant from the Canada Foundation for Innovation, according to a release.

These are the items in your home that are more likely to grow bacteria and pathogens, and this is how often you need to replace them.