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    Original site: www.cdc.gov/flu/travelersfacts/index.html | RestoredCDC.org is an independent project, not affiliated with CDC or any federal entity. Visit CDC.gov for free official information. Due to archival on January 6, 2025, recent outbreak data is unavailable. Videos are not restored. Access data.restoredcdc.org for restored data. Use of this site implies acceptance of this disclaimer.
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        Influenza (Flu)
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    About Signs and Symptoms Causes and Spread Flu Complications and People at Higher Risk Prevention Vaccine Basics Diagnosis Flu Treatment View All
September 17, 2024
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  Flu Prevention: Information for Travelers
          What to know
          The risk for exposure to flu during travel depends somewhat on the time of year and destination. Travelers in the Northern and Southern Hemispheres can be exposed to flu during months that fall outside of those listed above, especially when traveling as part of large tourist groups (e.g., on cruise ships) that include people from areas of the world where influenza viruses are circulating.
        Overview
          * In the Northern Hemisphere, the influenza (flu) season can begin as early as October and can last as late as April or May.
          * In the temperate regions of the Southern Hemisphere, flu activity typically occurs during April – September.
          * In the tropics, flu activity occurs throughout the year.
          * Travelers in the Northern and Southern Hemispheres can be exposed to flu when traveling in areas where flu activity is occurring.
          CDC Recommends...‎
              Everyone 6 months and older should get a flu vaccine yearly, preferably in the fall before the U.S. flu season begins.
        People who have not gotten a flu vaccine
        People who have not gotten a flu vaccine for the current season and are traveling to parts of the world where flu activity is ongoing should get a flu vaccine to protect themselves during their trip.
          * This is particularly important for people at higher risk of flu-related complications.
          * The flu vaccine used in the Northern Hemisphere can be different from the one used in the Southern Hemisphere. But the Northern Hemisphere vaccine can provide some protection against the main viruses that are circulating in other parts of the world.
          Keep Reading: People at Increased Risk for Flu Complications
        People should get vaccinated
        People should get vaccinated at least 2 weeks before travel because it takes time about two weeks after vaccination for antibodies to develop in the body that provide protection against flu illness.
          * No information is available about the benefits of getting revaccinated before summer travel for those people who already were vaccinated during the preceding fall, so revaccination is not recommended.
          * Keep in mind that flu vaccine manufactured for the upcoming or current season usually expires the following June. After June, flu vaccines are usually not available in the United States until flu vaccine for the next season is produced and made available in the late summer and fall.
          * Also, even if you receive the previous season's vaccine before travel during the summer months, you should still receive a new flu vaccine that coming fall or winter.
        More Information for Travelers
          * If you are sick with flu-like symptoms, do not travel. Stay home and away from others. You can go back to your normal activities when, for at least 24 hours, both are true:
          * Your symptoms are getting better overall, and
          * You have not had a fever (and are not using fever-reducing medication).*
          * After these two criteria are met, there are some additional precautions that can be taken to protect others from respiratory illness. More information is available at About Preventing Spread of Respiratory Viruses When You're Sick.
          Keep Reading: Flu: What To Do If You Get Sick
        Flu signs and symptoms include:
          * fever (not everyone with flu will have a fever.)*
          * cough or sore throat
          * runny or stuffy nose
          * muscle or body aches
          * headache
          * fatigue
          * some people may have vomiting and diarrhea, though this is more common in children than adults.
        Travel Preparation
        Investigate current flu activity in your region of travel. The Centers for Disease Control and Prevention provide frequently updated information on seasonal flu activity throughout the world.
        Travel Resources
                Travelers’ Health Website (General)
                Traveler Information Center
          Influenza Prevention: Information for Travelers‎
              Get more information on influenza for travelers from CDC's publication Health Information for International Travel (commonly called the Yellow Book).
            CDC Yellow Book 2024
        During and After Your Trip
        During your trip, follow local guidelines and practice healthy habits.
          * Avoid close contact with sick people.
          * Wash your hands often with soap and running water, especially after coughing or sneezing.
          * If soap and water are not readily available, use a hand sanitizer that contains at least 60% alcohol. Cover all surfaces of your hands and rub them together until they feel dry.
          * Cover your mouth and nose with a tissue when you cough or sneeze and put the used tissue in the trash. If you don't have a tissue, cough or sneeze into your upper sleeve, not your hands.
          * Sneeze into your upper sleeve, not your hands. Wearing a mask is an additional prevention strategy that you can choose to further protect yourself and others.
        What to do if you feel sick
        Most people with flu will recover without needing medical care. However, if you have severe illness or are at increased risk of getting serious flu complications, seek medical care.
          Keep Reading: People at Increased Risk for Flu Complications
        A U.S. consular officer can help you find local medical care in a foreign country. To contact the U.S. embassy or consulate in the country you are visiting, call Overseas Citizens Services at: 1-888-407-4747 if calling from the U.S. or Canada, 00-1-202-501-4444 if calling from other countries. You can also visit the websites of U.S. Embassies, Consulates, and Diplomatic Missions to find the contact information for the local U.S. Embassy of the country you are visiting.
        Follow all local health recommendations.
        Tips for After Your Trip
        Closely monitor your health for 7 days. If you become ill with flu symptoms, seek medical attention if they are severe.
        If you traveled and feel sick, particularly if you have a fever, talk to a healthcare provider and tell them about any areas you recently traveled to.
        If you need medical care abroad, Getting Health Care During Travel.
        On This Page
            * Overview
            * People who have not gotten a flu vaccine
            * People should get vaccinated
            * More Information for Travelers
            * During and After Your Trip
            * Tips for After Your Trip
          Related Pages
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            * Flu Treatment
    Health Equity and Flu
            * Caring for Yourself and Others
            * Flu and Healthy Lives for All
            * Information for the Flu Season
            * Flu Vaccine Safety
          View All Influenza (Flu)
    Flu and Healthy Lives for All
  September 17, 2024
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          Content Source:
        National Center for Immunization and Respiratory Diseases (NCIRD)
        Sources
          * Kampf G, Kramer A. Epidemiologic background of hand hygiene and evaluation of the most important agents for scrubs and rubs. Clin Microbiol Rev. 2004 Oct;17(4):863-93.
          * Todd EC, Michaels BS, Holah J, Smith D, Greig JD, Bartleson CA. Outbreaks where food workers have been implicated in the spread of foodborne disease. Part 10. Alcohol-based antiseptics for hand disinfection and a comparison of their effectiveness with soaps. J Food Prot. 2010 Nov;73(11):2128-40.
          * Many authorities use either 100 (37.8 degrees Celcius) or 100.4 F (38.0 degrees Celsius) as a cut-off for fever, but this number actually can range depending on factors such as the method of measurement and the age of the person, so other values for fever could be appropriate. CDC has public health recommendations that are based on the presence (or absence) of fever. What is meant by this is that the person's temperature is not elevated beyond their norm.
      Related Pages
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        * Flu Treatment
        * Caring for Yourself and Others
        * Flu and Healthy Lives for All
        * Information for the Flu Season
        * Flu Vaccine Safety
      View All Influenza (Flu)
  Back to Top
    Influenza (Flu)
    Influenza (flu) is a contagious respiratory illness caused by influenza viruses that infect the nose, throat, and lungs.
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        For Everyone
          * About
          * Signs and Symptoms
          * Causes and Spread
          * Flu Complications and People at Higher Risk
          * Prevention
          * Vaccine Basics
          * Diagnosis
          * Flu Treatment
          * View all
          Health Care Providers
            * Clinical Guidance
            * Clinical Signs and Symptoms of Influenza
            * Guidance for Influenza Vaccination
            * View All
          Public Health
            * How CDC Classifies Flu Severity each Season in the United States
            * Information for Laboratories
            * Understanding Influenza Viruses
            * View All
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