At least 162 passengers and 11 crew members reported being ill on the Caribbean Princess, a Princess Cruises ship out of Houston. Officers with the Centers for Disease Control and Prevention will board the ship to investigate the illness, which has been confirmed to be norovirus.

Norovirus is also suspected on board Royal Caribbean line's Explorer of the Seas. That ship reported nearly 700 crew and passengers had fallen ill, and returned to port two days ahead of schedule on Wednesday.

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