Sailed Celebrity last July. Celebrity CHOOSES to share covid-positive case numbers with guests and actively encourages you to see medical help from their staff if you are feeling unwell. Their social media in the past year has focused on upgraded medical facilities and staff. Carnival chooses to NOT share their numbers or actively encourage people to seek medical attention and generally acts as though there is no issue unless pressed by a federal agency. I got off Mardi Gras with a head cold in April that turned out to be covid. I did not wear a mask but there were people on board wearing them indoors throughout the entire cruise. No regrets. Being boosted helped. My cabinmate who drove 9 hours home with me and my "cold" never got covid.