** FILE ** This undated Negative-stain Transmission Electron Microscopy image, provided by the U.S. Environmental Protection Agency EPA, shows a Norovirus, also known as the Norwalk Virus. Norovirus is a genus of viruses of the family Caliciviridae. Recent scientific findings reveal that the genus causes around 50 percent of all gastroenteritis around the world. (AP Photo/F.P. Williams, U.S. EPA)
February 5, 2012 3:40:22 PM PST
NEW ORLEANS (AP) - February 5, 2012 --
A stomach virus has stricken people on a third U.S. cruise ship, with a vessel sailing from New Orleans delayed by norovirus.