An ongoing measles outbreak in Ontario has been traced back to a large gathering in New Brunswick last Fall, which was attended by guests from Mennonite communities. This news was confirmed earlier this week by Dr. Kieran Moore, Ontario’s Chief Medical Officer of Health. What does it tell us about the virus’ ability to spread, and how can we better control future outbreaks? Dr. Mitch Schulman is an emergency medicine specialist and a medical analyst for CTV News. He joins guest host Chris Holski on CFRA Live.