Your risk is not necessarily with the ship, it comes instead from your fellow passengers and by extension anyone they have been in contact with on their way to the ship. In other words, it's the same risks you face going to the mall, a movie, a restaurant...in fact, I think any of those places would score miserably if subjected to the same inspection standards as cruise ships.
Anywhere you go nowadays, there is always a chance of getting sick. The main thing is to always, always, always wash your hands after using handrails, shaking hands with someone, using a door handle...etc. Never touch your eyes, nose or mouth. Like your Mom always told you, "Wash your hands!". That'll cut down on germs being transferred from one to another. There are hand sanitizers left and right around the buffet lines.
That Norwalk Like Virus usually walks onboard the ship when someone is ill. Your fellow passengers are the ones who will be transmitting the virus left and right. If anyone is reported with that virus, they have to stay in their cabin for a few days.
You can contract that virus at the movie theatres, hospitals, schools, offices....always in enclosed places where there are large groups of people...not just on cruise ships.
Enjoy your cruise...just take those necessary precautions and you should be fine.
as the others have stated its not the ship that is sick its a fellow passenger who brings the virus aboard either knowingly or unknowingly. Get a flu shot if you haven't already. Pack a bottle of hand santizer, some folks even pack Lysol wipes, wash your hands.
We are on the Golden May 8th '05 transatlantic so have been doing some research. We read in a number of the fall reviews folks who had gotten sick but because there weren't a significant % of the folks on board they did not have to report it. Then in Dec. the Norwalk % of infected folks on the Golden reached the point it had to be reported to the center for disease control.
I had trouble pasting all the links for the detailed reports and scores and such but if you naviagate around the site you will likely find all that. Basically they had a disinfection/review in Dec. due to the severity of the outbreak. So you can take this as good in that hopefully they got it or bad that they had it in the first place. We are going to take it as good for our May cruise in that hopefully they fixed the problems. We have been on Golden for a 10 day Med. and Grand for a 17 day transatlantic and know they have the hand sanitizer at the buffet lines but not everyone uses it. In addition they have signs in the restrooms asking folks to wash their hands but you will always see those who don't. However we are both 38 and in good health so would not likely have severe health problems from a Norwalk type virus. If I had health problems or were significantly older I would probably think twice about cruising in general with so many ships having problems. We will bring our hand santizer, use it before the buffet and after getting our food and hope for the best. Best of luck to you to!