The numbers: 15 million people in a country of 37 million had personal information "potentially accessed in this breach." In several provinces, LifeLabs is dominant and sometimes the only option for lab work.

Here is the CEO's letter to those 15 million or so victims: https://customernotice.lifelabs.com

Concerned Canadians could/should contact their government about this incident. I don't have a deep link but assume it's buried in this maze: https://www.priv.gc.ca/