My wife, our daughter, son-in-law, and I all caught it on a cruise to Alaska two weeks ago. I’ve been on the full prophylaxis protocol (Vit C, Vit D, zinc, NAC, quercetin, melatonin) since April 2020. Nobody else has. Daughter and son-in-law not vaxxed; my wife and I got two shots plus one booster, then quit.
We all caught it. It was a mild-to-moderate cold with muscle aches like the flu. No temperatures which was weird. We all got better. So far, no lingering effects.
As people frequently say, those cruises are floating petri dishes.
You must have been on same cruise as our cousins...they got it, too...