You must have been on same cruise as our cousins...they got it, too...
LOL...I think everybody gets it on a cruise.
We took an excursion train ride on the White Pass & Yukon Route out of Skagway (absolutely fascinating history and civil engineering landmark, BTW). One woman in our car was coughing like crazy. I can’t believe she didn’t stay home. You were prohibited from changing cars while riding.
Four of our party of six were on the train ride in that car and got sick. Two didn’t go and I don’t think they got sick.
So maybe it was the train, not the ship. But who knows?