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Cruise lines tell the passengers to use hand sanitizers, but the culprit may be norovirus-laden salad.
CNN: What cruise lines don't want you to know
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There are more cases of norovirus - or winter vomiting bug - around than in recent years, but we are a long way off the peak of early 2010.
BBC: Top ten Christmas health risks
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The norovirus bug - which causes vomiting, stomach cramps, fever and diarrhoea - is easily spread from person to person.
BBC: Royal Lancaster Infirmary norovirus visiting ban lifted
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Specifically, research shows that somewhere between 48% to 93% of all food-borne norovirus outbreaks may be tracked back to sick food service workers.
CNN: Fight flu, give restaurant workers paid sick leave
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More than 400 passengers on the cruise ship Oriana were confined to cabins due to norovirus during a 10-day Baltic cruise from Southampton in December.
BBC: P&O Oriana
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During known outbreaks, a diarrheal illness is likely to be Norovirus and an influenza-like illness (defined as temperature of 100 or greater, cough or sore throat, and not other explanation) is likely to be flu.
FORBES: Influenza Wants You
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In Australia, the norovirus season has lasted longer than usual - they are now seeing cases into their summer.
BBC: Winter vomiting bug norovirus levels dip over Christmas
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So far this year there have been a total of 8 norovirus outbreaks on U.S.-flag cruise ships, compared with 15 for all of 2009.
FORBES: Magazine Article
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When they infect, norovirus and flu replicate at an incredible rate - producing billions of new viruses every day.
BBC: Winter bugs: A yearly battle for dominance
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"Because we have an old hospital, with six-bedded bays, if one person has norovirus, you have to close six beds, " she said.
BBC: Jersey hospital wards reopen after norovirus outbreak