A) there’s no way to know if they caught it on board or in ports since Covid is everywhereAlso, wasn't there just a cruise ship that had an outbreak of 200+ cases? Imagine how much worse it would have been with no restrictions and unvaccinated guests allowed.
B) the infection rate on most ships is rather low. Around 0.3%
C) as almost all guests are vaccinated, unlike really anywhere else, severe cases are exceedingly rare.
I would argue it is arbitrary to require so many to be vaccinated and to still test. No where else does that. I‘m not entirely sure what the CDC is aiming to prevent. Vaccinated people from getting Covid? They’re getting it regardless. Just demand a booster at 270 days.