If you are stuck on a cruise ship with sick people, it seems logical that cross-infections will be high. Cruise ships have thousands of people packed in close quarters. Besides common ventilation systems, everyone (including staff) touches the same dining tables, chairs, doorknobs, buffet carts, slot machines, etc. etc.
Don’t forget elevator buttons and menus.
I wouldn’t have been leaving my room.
They could send down some cereal for a few weeks.
I’d cover the vents too.
This is a high stakes game.
Act like your life depends on it.
If, as presently expected, the population of asymptomatic carriers increases that aspect may well come to bear on our nation's commercial air fleets. Our 9-11 experience could appear insignificant in comparison.