The unannounced inspection took place during the third day of Vista's 11-day inaugural US and Canada cruise.
Perfect marks on all 44 items
To earn a 100 score, cruise ships must receive perfect marks on all 44 items that comprise the comprehensive Vessel Sanitation Program checklist.
'Everyone on board works hard each and every day to ensure the highest of standards are reached. A score of 100 carries considerable magnitude, and we applaud the entire crew and officers aboard Vista for this stellar achievement,' Oceania President Frank A. Del Rio said.
Vista Capt. Luca Manzi added his thanks to the crew for ensuring 'this beautiful vessel of ours is acknowledged for being one of the cleanest ships in the fleet.'