Something to pass along to potential clients who are concerned about shipboard illnesses:
"In 2013, CLIA reports, there were seven norovirus outbreaks reported to the CDC, involving a total of 1,238 passengers. Approximately 10.1 million passengers embarked on a CLIA cruise ship from a U.S. port in 2012 (2013 data is not yet available). So the number of passengers suffering from a gastrointestinal illness is approximately 0.102 percent.
Don’t believe CLIA? The CDC’s Vessel Sanitation Program (VSP) tracks such outbreaks. Cruise ship medical staff are required to send gastrointestinal illness reports to VSP 24 to 36 hours before arriving at a U.S. port from a foreign port — even when there are no cases to report.
Separate notification must be made when 2 percent or more of the passengers or crew are ill with gastrointestinal illness. The VSP staff conducts an investigation and makes a report public when the number reaches 3 percent or more.
So, for 2013, my research found nine CDC gastrointestinal illness outbreak reports from cruise ships, affecting 1,505 passengers. Seven of those outbreaks were judged to have been caused by norovirus, which affected 1,321 passengers.
So put that into perspective: the CDC says norovirus, the most common cause of acute gastroenteritis in the U.S., causes 19 million to 21 million illnesses each year. An infinitesimal percentage catches it on cruise ships, so in no way is it only a “cruise ship illness.” You can look up these statistics up yourself
here."