As with anywhere, on land, or ship, people get sick. With several thousand people together, the odds are that people will get sick, just like anywhere else. I think that this tends to get blown out of proportion a bit. I know that Disney would notify if there was a problem. I was on the Nov. 23rd last year, and if they wouldn't have notified us even then, I would have never known there was even a problem. I didn't notice one bit of sickness. I was just on the May 3rd sailing and it was perfect as usual, nothing out of the ordinary. Had a blast, can't wait until next time.....