The ship was on a nearly month long cruise and had over 4,000 people onboard. During the cruise, 172 people became ill with the norovirus. It is highly contagious.
When the people disembark from the ship in Los Angeles they will be met by the CDC. They will test the passengers for the disease.
Afterwards, the Crown Princess will be decontaminated following guidelines established by the CDC. Then the ship heads off on another cruise in the Mexican Riviera.
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Source: http://www.nydailynews.com/life-style/health/172-people-cruise-fall-ill-norovirus-cdc-article-1.2013110
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Photo Credit: Unchanged; from https://www.flickr.com/photos/daniel_jurena/8233088350
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Keywords: norovirus, Crown Princess, CDC, Los Angeles