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JAMA. 2009;302(2):140.

	Since this article does not have an abstract, we have provided the first 150 words of the full text and any section headings.

MMWR. 2009;58:312

The influenza season in temperate climates extends from October through March in the northern hemisphere and from April through September in the southern hemisphere.^1-3 Recent studies indicate that influenza viruses can circulate throughout the year in the tropics and that influenza is the most frequently acquired vaccine-preventable disease among those traveling to tropical and subtropical countries.^2-5 Influenza outbreaks have been reported among persons who travel from the northern hemisphere to the southern hemisphere and among persons from the northern hemisphere on group tours.^4-7 To reduce the risk for influenza during travel, the Advisory Committee on Immunization Practices (ACIP) recommends that persons from the northern hemisphere who are recommended for annual vaccination or who want to avoid influenza illness but have not yet received the 2008-09 influenza vaccine should consider being vaccinated (1) before travel to the southern hemisphere during influenza season, (2) before travel to the tropics at . . . [Full Text of this Article]

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