Hi,
I got off Quantum on Friday 18th November, while on board i thought i did everything possible to stay safe, never went to MDR, didn't go to the theatre wore a mask a lot of the time when around the ship, sanitised hands all the time, so when i got off i thought all was good.
Wrong, by Sunday not feeling to good, i tested negative then, Monday feeling even worse, tested positive, so i have spent the last week battling the dreaded Covid.
So you can be as carful as possible and still be unlucky to catch it. Just glad i didn't catch it while on board, i don't think it would have been very nice going through all those aches and pains in your cabin.