Thank you, Mr. Chair.
I'd like to go back, if I can, to the issue of infection-acquired immunity. I have seen other data and heard from other immunologists who have stated that using a vaccine that was developed against the alpha variant and boosting it to deal with a virus in circulation that has mutated significantly, particularly on the spike protein, by logic should reduce its efficacy. What would your position be on that, Dr. MacDonald? In other words, if we get a third booster or a fourth booster, are we not just boosting the production of antibodies to deal with a virus that is not particularly in circulation as it once was?