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Is Your Cruise Ship Sick?

by Linda Coffman

When hundreds of cruise passengers report to the infirmary with similar symptoms, does that necessarily mean their ship is SICK?

Hardly. But you'd never know that from news reports about nasty cruise ship diseases that attack unsuspecting vacationers. CruiseDiva.com would like to honor CBS News with the Most-Misleading-Headline Award Ever for... "Voyage of the Sick Docks in NYC"! That one appeared several years ago and is hard to top, although  UK news outlets keep trying with the use of "vomiting bug" and other equally as distasteful expressions.

Fact vs. Rumor
Let's face the facts first—travel by cruise ship often brings together large numbers of people from different regions of North America, as well as other parts of the world. In confined quarters, certain respiratory and gastrointestinal diseases can quickly spread from person-to-person contact. In addition, when ships dock and passengers go ashore, they might be at risk for diseases prevalent in the ports of call they visit. It is even quite possible that some passengers who become ill during a cruise were infected prior to boarding and they were actually "sick" before their symptoms became apparent.

Wait a minute... before we examine specific illnesses, let's think about how and when passengers are likely to be exposed to them. Cruise ships aren't the only places where large groups of people are likely to get together and outbreaks of "flu" and the "24-hour stomach bug" are common in such places as schools, nursing homes, and even hospitals. According to Princess Cruises, "Statistics have shown that the chance of contracting Norovirus on land is 1 in 12; and 1 in 4000 on a cruise ship."

Because respiratory and gastrointestinal diseases can percolate a few days before their symptoms strike with a vengeance, it is highly likely that some passengers bring their "bugs" on board with them. Before reaching a cruise ship, many—if not most—passengers pass through airports to board airplanes (with re-circulated, stuffy air) and they may spend the night in a hotel at their embarkation port and eat in local restaurants. Each of those places are breeding grounds for germs.

While most people are unaware that they have contracted an illness before embarking, others know they are sick but go aboard anyway, not acknowledging their illness for fear of being denied boarding. They might not seek treatment once on board due to the threat of being confined to their staterooms. These "alpha passengers" can be the beginning of a ship-board epidemic!

What To Do
According to the U.S. Center for Disease Control (CDC), "Anyone who becomes ill while on a cruise ship should seek medical attention on board and see a health care provider upon returning home. Ill persons should limit contact with the general population on board as much as possible to reduce further spread of disease. People planning cruise ship travel, especially anyone older than 65 years of age, anyone with acute or chronic illnesses, or pregnant women should consult with a health care provider prior to travel for advice and possible preventive medication. Other measures to prevent the spread of infectious diseases on cruise ships include frequent hand washing and obtaining appropriate immunizations prior to travel."

Two of the most prevalent diseases that spread through cruise ship populations are Influenza and Noroviruses.

Influenza
In recent studies, influenza infection among travelers is quite common; hence, it may rank with hepatitis A as one of the most common vaccine-preventable travelers' diseases. Seasonal epidemics of influenza generally occur during the winter months on an annual or near annual basis and can cause disease in all age groups. While rates of infection are highest among infants, children, and adolescents, rates of serious illness and death are highest among persons over 65 years of age and persons of any age who have medical conditions that place them at high risk for complications from influenza (e.g., chronic cardiopulmonary disease).

The risk for exposure to influenza while traveling depends on the time of year and destination. In the tropics, influenza can occur throughout the year, while in the temperate regions of the Southern Hemisphere most activity occurs from April through September. In temperate climates, travelers can also be exposed to influenza during the summer, especially when on board a cruise ship with travelers from areas of the world where influenza viruses are circulating. Influenza might be, at best, an inconvenience; however, it can lead to complications, including life-threatening pneumonia, especially among persons at increased risk for complications. Annual influenza vaccination is the primary method for preventing influenza and its complications.

Norovirus  
These are a group of related viruses that cause acute gastroenteritis in humans. Norovirus was recently approved as the official genus name for the group of viruses provisionally described as "Norwalk-like viruses" or  NLV. The incubation period for norovirus-associated gastroenteritis is usually between 24 and 48 hours, but cases can occur within 12 hours of exposure. Norovirus infection usually presents as acute-onset vomiting, diarrhea with abdominal cramps, and nausea. Low-grade fever also occasionally occurs and vomiting is more common in children. Dehydration is the most common complication, especially among the young and elderly, and may require medical attention. Symptoms generally last 24 to 60 hours. Recovery is usually complete and there is no evidence of any serious long-term effect.

Highly contagious Noroviruses are transmitted primarily through the fecal-oral route, either by consumption of contaminated food or water or by direct person-to-person spread. During outbreaks of norovirus gastroenteritis, several modes of transmission have been documented; for example, initial food borne transmission in a restaurant, followed by secondary person-to-person transmission to household contacts.

Norovirus is often termed the "cruise ship virus," even thought the vast majority—some 60 percent to 80 percent of outbreaks—occur on land. However, it is often more unmistakable on cruise ships because all sick passengers and crewmembers are treated by the same physician, who is required to prepare a special report for the CDC if an outbreak affects 2% or more of the passengers or crew. The CDC launches and investigation if 3% of passengers or crewmembers become ill.

What to do?
First and foremost—WASH your hands often with hot water and soap. A waterless, sanitizing hand cleaner is also recommended for times when soap and water aren't available (they are effective and come in travel size bottles). Some passengers even go so far as to pack disinfectant wipes or a small aerosol can of germ-killing spray to treat their stateroom furnishings, bedding, and personal bathrooms before using them.

If you get sick, seek medical treatment and try not to infect other passengers.

Princess Cruise Line did everything right—read how they effectively dealt with Norovirus on Regal Princess in August/September 2003.

Sources: Centers for Disease Control & Princess Cruises


Pack a Cruise Travel First Aid Kit and be prepared for small emergencies. Get CruiseDiva.com's list of what to include.

Cruise CareThe ship's Sick Bay. You hope you won't need it but it's comforting to know you can depend on it, if only for a bandage.

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CDC Vessel Sanitation ScoresCheck out your ship before you sail.

The Centers for Disease Control and Prevention (CDC) established the Vessel Sanitation Program (VSP) in 1975 as a cooperative endeavor with the cruise vessel industry. The VSP utilizes a two-prong approach to disease control aboard cruise ships:

  • Prevent the introduction, transmission or spread of communicable diseases into the United States through established public health policies and procedures.
  • Assist the cruise ship industry in the development and implementation of comprehensive sanitation programs to protect the health of passengers and crew members aboard cruise vessels.


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