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The United States Public Health Service subjects every ship with an international itinerary calling into US ports to two unannounced inspections a year.

Last week, Carnival Cruise Line’s Carnival Splendor was subjected to one such inspection. She achieved a perfect score. What’s more, this is the fifth perfect score for the ship since she entered service in 2008 (she has also achieved a near-perfect 99) – an industry first.

This level of cleanliness and hygiene is not easily achieved. The United States Public Health Service has a comprehensive Vessel Sanitation Program checklist consisting of 42 items, including such areas as food handling, preparation, storage procedures and overall galley cleanliness, as well as water used in spas and pools.

Carnival Splendor is a 3,006-passenger, 113,300-ton ship that operates year-round seven-day Mexican Riviera cruises from Long Beach, California.

How do you think Carnival Splendor manages to be so clean?