Number sick on 'Explorer of the Seas' cruise ship nears 700, returns to port in New Jersey

... one of the largest norovirus outbreaks in last 20 years, the CDC said. A 2006 norovirus outbreak on a Carnival Cruise Lines ship also sickened close to 700. Norovirus -- once known as Norwalk virus -- is highly contagious. It can be picked up from ...

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