Thank you, Chair, and thank you to all the witnesses for explaining your area of research. It's really fascinating to see all the little pieces hopefully coming together.
I'd like to start with Dr. Tremblay. I was very interested in the cohort that was followed for some 35 years and apparently showed very limited or short-term immunity to coronaviruses. In your view, why would a vaccine necessarily be different in terms of allowing for continued immunity?