Just as Canada and countries around the world struggle to contain COVID, another wrench has been thrown into the mix. How does a virus mutate? Should you be worried about the COVID variants? Does it affect how existing vaccines work? Two experts, two interviews: Dr. Tony Mazzulli, Microbiologist-in-Chief of the University Health Network and Mount Sinai Hospital's microbiology department, along with Dr. Isaac Bogoch, infectious disease expert and clinician at the University Health Network, join "This Matters" host Adrian Cheung to demystify the science behind virus mutations, what to know about protecting yourself and what can be done to control the new strains of the virus.