Get boosted too. >> that's where, you know, so many of us are echoing, go ahead and make sure that you get vaccinated, if you haven't gotten your first or second dose, and getting your booster dose, that's really what's going to protect you right now. >> reporter: and now, the cdc has issued its highest warning yet for cruise ship travel, at least recently, basically saying even if you are vaccinated, cruise ships are simply not a safe place for you to be in terms of the current variant and the current surge out there. they have been investigating dozens of ships where there have been outbreak...