While it's terrible to have (trust me) and while it's probably one of the last things you want to have whilst on vacation - it's hardly uncommon elsewhere in the world. People need to stop referring to this as the cruise ship virus when it's just as possible to contract it from hospitals or even subways.
What does this mean for people? Wash your hands. Wash your hands. Wash your hands. Good hygiene is key in fending off the virus so just do it; wash your hands.