Your story about the Veendam is not in keeping with our experience, because Holland America certainly does not try to disguise Norwalk as food poisoning or anything else. I believe they did everything they could to knock it out on the Statendam and indeed, they succeeded. The captain made a public announcement about it almost every day. By the time we got to Alaska there were no cases aboard, and all restrictions were lifted. In both Hong Kong and Osaka the ship was completely sterilized and ship sterilization was an ongoing thing throughout the voyage.
Norwalk does frequently, (too frequently) show up on cruise ships but that is not the only place. The most frequent location is schools. It has been around forever and it is what we used to inaccurately call the "24 hour stomach flu."
Landlocked in Denver, but cruisin every chance we get.
Polynesia, Carib. '86
Cr. Odyssey, Scandinavia, '91, 30 Day S Pac. 2002
Crystal Harm, Aust., N.Z., '94
Royal Odyssey, AK,'96
Old Cr. Pr. Canal, '97
RCCL, Carib, 1998
Volendam, Car, 2000
Ryndam, 35 day S. Am., Antarctica, '03
Is. Pr., Canal, 2004
Statendam, 34 day China, Japan, AK '06
Cr.Pr., Carib. 08
Eurodam, Atlantic, Med. '10