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Cruise ships are notorious for stomach bugs such as Norovirus.
Frequent handwashing and use of hand sanitizer.
Especially after touching handrails on stairs, door handles/knobs, elevator buttons, handrails on deck, etc.
Try not to touch your mouth, eyes, or nose until you’ve washed/sanitized your hands.
Essentially, anything someone else could have touched before you is a reason to wash up.