Should travelers to the Southern Hemisphere from the Northern Hemisphere (or a vice versa) receive a second dose of flu vaccine later in the same flu season?
Per the CDC : The risk for exposure to influenza during travel depends on the time of year and destination. In the temperate regions of the Southern Hemisphere, influenza activity occurs typically during April–September. In temperate climate zones of the Northern and Southern Hemispheres, travelers also can be exposed to influenza during the summer, especially when traveling as part of large tourist groups (e.g., on cruise ships) that include persons from areas of the world in which influenza viruses are circulating. In the tropics, influenza occurs throughout the year. In a study among Swiss travelers to tropical and subtropical countries, influenza was the most frequently acquired vaccine-preventable disease. Any traveler who wants to reduce the risk for influenza infection should consider influenza vaccination, preferably at least two weeks before departure.
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