In the case where he has _not_ every been infected, I see no reason to assume any future infection would be asymptomatic. Besides you can always have it asympt

In the case where he has _not_ every been infected, I see no reason to assume any future infection would be asymptomatic. Besides you can always have it asymptomatic once and then worse later. My girlfriend had a light (well it was still comparable to a bad flu) case in the beginning of the pandemic and then a year later a much worse case that took more than 6 months to fully recover from.