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Every ship that travels to foreign ports, and carries 13 or more passengers and calls on a port in the United States is subject to the Vessel Sanitation Program. This program is monitored by the Centers for Disease Control and Prevention (CDC). These vessels are inspected (unannounced) twice a year, and are subject to re-inspection, when necessary. Currently there are over 170 ships that participate in this program.
Inspections focus on:
Ships are given a score based on a 100-point scale. To pass inspection, a ship must score 85 or above. If a ship fails inspection, it will generally be re-inspected within 30 to 45 days.
Please see the Online Resources Section for inspection scores published online, as well as in a publication (often referred to as the "green sheet"), which is distributed to 6,000 travel-related services around the world.
Generally, the lower the score, the lower the level of sanitation. However, a low score does not mean passengers will suffer gastrointestinal or other illnesses. Ships are required to maintain a standardized gastrointestinal illness report for each cruise, with the number of cases of illnesses by dates of onset and total numbers of passengers and crew members affected.
If at least three percent of passengers and/or crew members have gastrointestinal illness on a given cruise, the Vessel Sanitation Program may conduct an investigation to determine if an outbreak has occurred.
Given the number of persons who enjoy cruises each year, the rate of gastrointestinal illnesses on cruise ships is very low. In the 1970s and early 1980s, there were 12 to 15 outbreaks of diarrheal illness each year on cruise ships. Since then the number of outbreaks has steadily decreased, according to a recent report.