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Article from ABC News:
For the third cruise in a row, some of the passengers aboard Celebrity Mercury have fallen ill, apparently with the norovirus.
The ship departed Charleston, S.C., last week. Then 350 of the 1,829 passengers aboard became sick, a spokeswoman for the cruise line told The Associated Press.
The crew onboard is "conducting enhanced cleaning, to help prevent the spread of the illness" and will return to Charleston a day early to "conduct an extensive and thorough sanitizing onboard the ship and within the cruise terminal," Celebrity Cruises said in a statement.
More than 14 million people are expected to take a cruise in 2010, according to the Cruise Lines International Association. So how can you help prevent any illnesses on your next cruise?
ABC News senior health and medical editor Dr. Richard Besser stopped by "Good Morning America" to explain how to stay healthy on the high seas.
The Norovirus
The norovirus is highly contagious and its symptoms include nausea, vomiting, diarrhoea, cramps and chills, Besser said.
The illness typically lasts 12 to 72 hours and usually occurs in places where people are in close quarters, such as schools, hospitals, nursing homes and cruise ships, according to Besser. It is the leading cause of food borne outbreaks of diarrhoeal disease, accounting for more than 50 percent of these outbreaks
It spreads through food, water, contaminated surfaces and person-to-person contact, Besser said. He added that the reason it could be so hard to get rid of on a cruise ship is because people can also bring it on board and it can live on surfaces for more than a week
Cruise ships often visit places that have poor sanitation, so passengers can easily catch it from a restaurant they visited at a port, Besser explained
Additionally, the infection dose of norovirus is very low, Besser said. It takes only 10 particles of the virus to make you stick, as opposed to the 100,000 particles of salmonella you would have to be exposed to in order to get sick
Therefore, even if the crew does a very good job of cleaning the ship it only takes a little of the virus to get people sick again.
How to protect yourself
Before you book a cruise, check the Cruise Ship's Inspection Score ship's inspection score at the Centers for Disease Control and Prevention's website. While this won't necessarily protect you from norovirus, it provides a good indication of overall ship hygiene.
The CDC gives all of the cruise ships a score for cleanliness and it reports these outbreaks through its vessel sanitation program.
Look to see if there have been recent norovirus outbreaks on your ship. A recent outbreak of norovirus may increase the likelihood of another outbreak soon after, Besser said.
Original article: How To Stay Healthy On A Cruise Ship - ABC News
Would you / do you check the ship's illness history before booking? Would it matter if you're booking 12 months in advance? A ship might have a clean sheet when you book but have an outbreak a week before you embark. Would you cancel at short notice?
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If only pax were trained like crew are!
don't want to work, just want to cruise. 
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