"The risk for exposure to influenza during travel depends somewhat on the time of year and destination.
- In the Northern Hemisphere, the 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, influenza activity typically occurs during April – September.
- In the tropics, influenza activity occurs throughout the year.
- Travelers in the Northern and Southern Hemispheres can be exposed to influenza 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.
CDC recommends that everyone 6 months and older get a flu vaccine yearly.
- Everyone 6 months and older should get a flu vaccine yearly, preferably in the fall before the U.S. flu season begins..."
Influenza
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