Is cruising a dirty way to travel? With so much news of cruise passengers coming down with norovirus, that may seem like the case but not all  of them dirty. Some cruise lines have a pretty good record for being sanitary.

More than 600 passengers and crew members came down with a gastrointestinal illness on Royal Caribbean's Explorer of the Seas this week, forcing it to cut the trip early and head back to port in New Jersey. The ship is undergoing an intense cleaning and is scheduled to commence with its next trip. Also this week, a Princess Cruise, the Caribbean Princess, also had to cut its trip short after more than 160 passengers came down with norovirus.

Despite this rough news for the cruise industry, not every cruise line is unsanitary. There are several cruise lines that haven't failed a Centers for Disease Control sanitation inspection in the past 10 years. Costa cruises has had 30 inspections and 37 percent got a perfect score. Norwegian has had 143 inspection with 28 percent having a perfect score. Oceania had 26 inspection with 27 percent at a perfect score. Disney Cruises had 48 inspection and 21 percent were perfect. Crystal Cruises had 31 inspections, 16 percent of which were perfect. Lastly, Seabourn had 38 inspections with a 5 percent perfect score, MarketWatch reports.

While these stats are good, many major cruise lines like Holland America, Silversea, Regent, Cunard, Carnival, Royal Caribbean, Princess and Celebrity have all failed their sanitation inspections. Over the past three years, some of these cruise lines have failed multiple times.

Cruise ships have tried to clean up their act though. Following an incident on Carnival Triumph, in which the ship lost power and the toilets weren't running properly, Carnival got perfect scores on five inspections.