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Norovirus

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Historic incidence rates of Gastrointestinal Illness aboard cruise ships are very low.  According to the U.S. Centers for Disease Control and Prevention (CDC) the vast majority of outbreaks occur in land-based settings.  Additional information can be found at CDC's Facts About Noroviruses on Cruise Ships.

In 2013, there were 4 norovirus outbreaks on cruise ships departing from U.S. ports involving a total of 834 passengers. To put that into perspective, 10.1 million passengers embarked on CLIA member cruise ships from a U.S. port in 2013 so this figure represents approximately eight one-thousandths of one percent (0.008%) of passengers. By contrast, the CDC reports there are up to 20 million norovirus cases in a typical year in the United States. Americans have a 1 in 15 chance of getting norovirus on land each year, compared to a 1 in 12,000 chance on a cruise.

For more information on norovirus from the CDC:

  1. CDC Press Release
  2. Vital Signs Report

One of the cruise industries' top priorities is preventing Gastrointestinal Illness from being brought on board a ship.  CLIA member cruise lines take steps designed to prevent unwell passengers from bringing norovirus on board a ship and in the rare instances of outbreak, have been shown they are able to immediately employ best practices to mitigate its spread and treat ill passengers and crew.

If necessary, the cruise line industry can employ a variety of enhanced sanitation practices, including implementing specific, well established Outbreak Prevention and Response Plans, designed to keep passengers healthy during their cruise vacations. Enhanced passenger health screening implemented by CLIA member lines, especially during the flu season assists in identifying ill passengers prior to boarding. CLIA member lines also educate their crew and passengers on proper hand hygiene practices in an effort to maintain a clean and healthy environment throughout the cruise vacation.  CLIA member lines also regularly communicate with one another, local and state health departments, the U.S. CDC and other international public health authorities to gather epidemiological information, identify sources of infection and share best practices.

Click here to view a Sample Cruise Line Questionnaire

Additional practices cruise lines employ to maintain a healthy environment on all ships include:

  • Regularly sanitizing frequently contacted hand touch surfaces such as door handles, railings and elevator buttons
  • Providing hand sanitizers to passengers during their cruise
  • Sending public health specialists as well as additional medical personnel to ships as required
  • Amending food service practices as required, to include providing staff service in traditionally self-service areas like buffets
  • Communicating well established educational hand hygiene practices and additional methods of decreasing the transmission of illness to all passengers and crew
  • Asking ill passengers to recuperate in their cabins until symptoms subside in an effort to reduce the spread of any illness of public health concern

Lastly, CLIA member lines report cases of Gastrointestinal Illness and share information collected from symptomatic passengers with local and federal health officials. Unlike land-based outbreaks, which are generally not reported, the robust reporting structure for shipboard cases of norovirus provides local and federal health officials valuable public health information.

This practice enables these agencies to better identify the original source of infection and allows the cruise lines to more effectively implement mitigation strategies. Among other details, this information includes flight and hotel information prior to embarkation.
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What is norovirus?
Norovirus, often referred to as a “stomach bug,” is a common type of gastrointestinal illness. It is the second most prevalent illness in the general population behind the common cold. Most norovirus infections are not serious and most people will recover from their symptoms within one or two days. Norovirus can be transmitted from person to person, by eating or drinking foods and liquids infected with norovirus, or indirectly from touching surfaces or objects infected with norovirus and then touching his/her mouth, nose or eyes. The number of cases can be amplified in areas of close living quarters such as dormitories, hospitals, nursing homes, schools and cruise ships.

What do cruise lines do to prevent illness from spreading?
Cruise lines wish to provide an enjoyable vacation and recognize that one ill passenger is one too many. In addition to screening passengers for illness before boarding, the cruise line industry employs a variety of sanitation practices and has specific, well-established and proven Outbreak Prevention and Response Plans.The most effective means of preventing the spread of the virus, based on the cruise lines' experience, include:

  • An aggressive communications effort on board ships encourages passengers to thoroughly wash their hands frequently. Washing one's hands regularly (every hour or two) is a very good way to help prevent getting and spreading any contact virus such as norovirus.
  • Aboard ship, staterooms and public areas are cleaned and disinfected as continuously as possible.
  • Cleaning procedures include the use of disinfectants on areas including, but not limited to: counters, bathroom surfaces, door handles, railings and grab bars, exercise equipment, video arcade equipment and vanities.
  • On turnaround days, extra crew may spend additional time cleaning and disinfecting the ship with the CDC-recommended disinfectants from top to bottom before additional passengers board.
  • Passengers with obvious symptoms of illness are asked to contact health personnel.
  • To avoid the risk of spreading the virus, passengers and crew who experience symptoms are asked to remain in their cabins. This procedure is endorsed by the CDC.

What can passengers do to protect themselves from norovirus and to stay healthy in general while on board?
The CDC and cruise lines cannot emphasize hand washing enough. The CDC provides the following information in their Cruising Tips.

  1. Wash your hands for 20 seconds or longer.
    Before and after eating or smoking.
    After touching your face or going to the bathroom.
    When your hands are dirty.
  2. Leave the area if you see someone get sick (vomiting or diarrhea).
    Report to cruise staff, if not already notified. You could become ill from contaminated particles that travel through the air.
  3. Take care of yourself.
    ⦁ Get plenty of rest and drink lots of water. Resting helps rebuild your immune system.
    Drinking water helps prevent dehydration.
  4. Be considerate of other people's health.
    If you're ill before taking a cruise, call the cruise line to determine if there are alternative cruising options.