I have sailed on Costa Classica, Romantica, Atlantica and Mediterranea.
Also Carnival Fantasy, Ecstasy, Celebration, Imagination, Carnivale (no longer with the company) Sensation and Jubilee.
RCCL Sovereign of the Sea
Holland America Zuiderdam, Maasdam, Noordam and Westerdam
Anytime you sail in an enclosed area with over 2000 people, you must take precautions with hand washing. Everytime you leave the ship and go into a foreign port, then you must be careful and cleanse your hands when entering the ship.
It doesn't make any difference what ship you are sailing on.........you must sanitize your hands!