www.norovirus.nl Causes around 50% of all gastroenteritis

The U.S. Centers for Disease Control and Prevention in Atlanta recorded 14 outbreaks of gastrointestinal illness on cruise ships visiting U.S. ports in 2010. A line-by-line breakdown:

Carnival Cruise Lines
Carnival Glory (10/9-10/16). 113 sickened. Cause: Unknown
Celebrity Cruises
Celebrity Mercury (2/15-2/26). 411 sickened. Cause: Norovirus
Celebrity Millennium (2/22-3/5). 157 sickened. Cause: Norovirus
Celebrity Mercury (2/26-3/8). 182 sickened. Cause: Norovirus
Celebrity Mercury (3/8-3/19). 406 sickened. Cause: Norovirus
Crystal Cruises
Crystal Symphony (11/2-11/21). 37 sickened. Cause: Unknown
Cunard Line
Queen Victoria (1/4-1/12). 179 sickened. Cause: Norovirus
Queen Victoria (1/12-27). 168 sickened. Cause: Unknown
Queen Mary 2 (12/19-1/3/2011). 185 sickened. Cause: Unknown
Fred Olsen Cruise Lines
Balmoral (1/5-2/4). 293 sickened. Cause: Unknown
Holland America
Maasdam (2/19-3/05). 168 sickened. Cause: Norovirus
Zuiderdam (4/20-5/08). 73 sickened. Cause: Unknown
Nieuw Amsterdam (10/18-11/07). 134 sickened. Cause: Norovirus
Royal Caribbean
Jewel of the Seas (2/22-3/5). 102 sickened. Cause: Unknown

Cruise ships arriving in U.S. ports must report all cases of gastrointestinal illness treated by on-board medical staff to the CDC’s Vessel Sanitation Program division, and a separate notification is required when the number of cases exceeds 2% of passengers and crew. When the number of cases exceeds 3% of passengers and crew the CDC issues a public report.