According to the CDC, 14 cruise ships earned a perfect health score during their surprise inspections in the last year.

The ships can be found among 10 different cruise lines and include Celebrity Summit, Rhapsody of the Seas, Norwegian Gem, Disney Wonder, Seabourn Quest, Viking Star, Auroa, Disney Fantasy, Noordam, Sea Princess, Disney Dream, Amsterdam, AIDAVITA and Emerald Princess.

All cruise ships that sail to or from the U.S. must undergo a surprise health inspection by the VSP or Vessel Sanitation Program.

Everything from the medical facilities to the swimming pools, portable water systems, child centres, rooms, ventilation systems and common areas of the ship are inspected.

There are 44 items on the VSP’s checklist, so to get a score of 100, the cruise ship had to receive perfect scores on every single item.

Alternatively, a score of 85 or below is considered failing which occurred with the following ships: Ocean Insignia, Ocean Dream, Silver Spirit, Safari Endeavor and Le Boreal.