The landmark decision makes it likely other Hong Kongers will be given sanctuary in Canada, which has emerged as a top destination for those fleeing Beijing's crackdown.
"The possibility of reinfections could have significant implications for our understanding of Covid-19 immunity, especially in the absence of an effective vaccine."
Remdesivir is expensive and there is a global shortage while dexamethasone has immunosuppression effects that are risky for all but the most ill patients.
Bids hit the $9 million mark in less than two minutes after the start of the auction, but after 14 minutes there were just three bidders left in the race.