These are the cleanest cruise ships, according to the CDC

There are many things to clean on the world's largest cruise liner. It has 18 bridges, can hold more than 6,600 passengers in 2,759 cabins, 25 swimming pools and jacuzzis, 23 restaurants, 42 bars and a crew of 2,200 people.

Given the proximity, you like to think that a cruise ship is clean. Last year, control and disease prevention centers recorded 11 different disease outbreaks on cruise ships. Until now, in 2019, there have been two, a confirmed norovirus. But according to the CDC, only a small proportion of millions of cruise ship passengers contract a gastrointestinal illness such as norovirus.

The CDC runs a program that helps cruise ships prevent outbreaks of gastrointestinal illness and trains cruise ship employees in sanitation practices. They perform unannounced inspections twice a year in US ports.

Inspectors examine the sources of water supply vessels, medical centers, kitchens and dining rooms, swimming pools, maintenance practices, pest management, children's play centers and ventilation systems.

Cruise ships are rated on a 100-point scale. Points are deducted from the score when there is a set of offenses similar to the same criteria or where there is a single and significant offense. An 85 or less is a failure score.

Ship-shaped vessels scored 98-100 points in the most recent inspections.

Photo: Shutterstock

Norwegian jewel

Norwegian jewel

Norwegian Cruise Lines (NCLH)

Score: 100

Photo: Mariusz Lopusiewicz / Shutterstock

Disney Wonder

Disney Wonder

Disney Cruise Lines (DIS)

Score: 100

Photo: KC Keller / Shutterstock

Viking Star

Viking Star

Viking Ocean Cruises

Score: 100

Photo: Steve Heap / Shutterstock

Dawn

Dawn

P & O Cruises

Score: 100

Photo: aquatarkus / Shutterstock

Disney Fantasy

Disney Fantasy

Disney Cruise Lines

Score: 100

Photo: Sergey Kelin / Shutterstock

Noordam

Noordam

Holland America Line

Score: 100

Photo: Debbie Ann Powell / Shutterstock

Sea Princess

Sea Princess

Princess Cruises

Score: 100

Photo: Noel Jones / Wikipedia

Disney Dream

Disney Dream

Disney Cruise Lines

Score: 100

Photo: Pixabay

Amsterdam

Amsterdam

Holland America Line

Score: 100

Photo: Shutterstock

AIDAvita

AIDAvita

Aida Cruises

Score: 100

Photo: MikhailBerkut / Shutterstock

Carnival breeze

Carnival breeze

Carnival Cruise Lines, Inc. (CCL)

Score: 100

Photo: Ritu Manoj Jethani / Shutterstock

Royal Princess

Royal Princess

Princess Cruises

Score: 100

Photo: Zakariaa El Mikdam / Shutterstock

Celebrity Reflection

Celebrity Reflection

Celebrity Cruises

Score: 100

Photo: Celebrity Cruises

Serenade of the seas

Serenade of the seas

Royal Caribbean International (RCL)

Score: 100

Photo: Mick Atkins / Shutterstock

Star Princess

Star Princess

Princess Cruises

Score: 100

Photo: meunierd / Shutterstock

Emerald Princess

Emerald Princess

Princess Cruises

Score: 99

Photo: DP STUDIO REVIEW / Shutterstock

Veendam

Veendam

Holland America Line

Score: 99

Photo: byvalet / Shutterstock

Celebrity Equinox

Celebrity Equinox

Celebrity Cruises

Score: 99

Photo: NAN728 / Shutterstock

Celebrity Infinity

Celebrity Infinity

Celebrity Cruises

Score: 99

Photo: David Litman / Shutterstock

Freedom of the seas

Freedom of the seas

Royal Caribbean International

Score: 98

Photo: Royal Caribbean

Radiance of the seas

Radiance of the seas

Royal Caribbean International

Score: 98

Photo: Philip Schubert / Shutterstock

Great princess

Great princess

Princess Cruises

Score: 98

Photo: Enrico Powell / Shutterstock

Ruby Princess

Ruby Princess

Princess Cruises

Score: 98

Photo: Stories in the light / Shutterstock

Carnival dream

Carnival dream

Carnival Cruise Lines, Inc

Score: 98

Photo: Sean Pavone / Shutterstock

Freedom of the seas

Freedom of the seas

Royal Caribbean International

Score: 98

Photo: Valerie Johnson / Shutterstock

Spirit of money

Spirit of money

Silversea Cruises

Score: 98

Photo: Strukt / Shutterstock

Celebrity solstice

Celebrity solstice

Celebrity Cruises

Score: 98

Photo: Leah-Anne Thompson / Shutterstock

Zaandam

Zaandam

Holland America Line

Score: 98

Photo: Andreea Dragomir / Shutterstock

Carnival legend

Carnival legend

Carnival Cruise Lines

Score: 98

Photo: irisphoto1 / Shutterstock

Norwegian Breakaway

Norwegian Breakaway

Norwegian cruise lines

Score: 98

Photo: Claude Huot / Shutterstock