Norovirus has hit two cruise ships, one in Tampa and one in Portland, in the past week:

Fox 13, April 13, 2007 – Full Story

TAMPA – Nearly 100 sick cruise ship passengers are back home today.

The Celebrity Cruise Lines ship Zenith docked at Channelside this morning. It set sail back on April 2 but over the course of the 11-day cruise, 86 passengers and 11 crewmembers came down with the norovirus.

Passengers on board say they weren’t kept in the loop about what was going on. Many didn’t realize anything was wrong until they saw crew members with masks on.