Three of our four family members contracted COVID at the end of our recent Marina cruise - many people were coughing and, of course in retrospect, we should have masked. We thought we were safe, as we ate by ourselves and, for the most part, did not go on organized tours. But one of us was on a bus tour where a passenger coughed constantly. Thank goodness for six vaccinations (in my case) - mild cases all around with lingering cough, etc. We'll know better next time.