The H1N1 strain of the swine flu is back — here's what you need to know

In 2009 we were hit with the H1N1 strain of the swine flu. It triggered widespread vaccinations. More than 120 people died in Ontario. And now it's back. Dr. Bryna Warshawsky, a medical director with Public Health Ontario, tells us what we need to know about this year's strain.