Everyone needs to educate themselves on the Norwalk Virus.
From the CDC:
Norwalk gastroenteritis is transmitted by the fecal-oral route via contaminated water and foods. Secondary person-to-person transmission has been documented. Water is the most common source of outbreaks and may include water from municipal supplies, well, recreational lakes, swiming pools, and water stored aboard cruise ships.
The PRIMARY source of contamination is WATER. Person-to-person is SECONDARY. THIS IS NOT THE FLU! Any talk about it coming aboard from another outside source (airplane) is not true. It is NOT an airborne transmittable diease!
(My theory is that this was caused by the selfish parents who insist that little Sally or little Johnny must be allowed to get in the pool in a diaper. Being a pool and spa owner, I am VERY aware of water sanitation and what it takes to keep it clean and safe.)
Most are still missing my point. When you bring up schools or hospitals or 2 out of 20, you are talking about occurences and situations where the cause is unknown. Yes, on any given school day 10-20 kids may be out sick. But are they all out sick with the same thing, and did they all contract it from the same place?
Disney says on any given cruise, 10 people will become ill. That is a far cry from the 275 last week, or the (so far) 85 reported this week. At what point do you feel is "too many?"
IMO, they should cancel the cruise. There is no way that they can eliminate the source when the source may be the VERY SAME PEOPLE WHO ARE DOING THE CLEANING!
Take the ship out of service for a week, bring aboard a complete cleaning crew from outside of the ship's crew, dispose of all food and water aboard, and start fresh.