Will a person who receives influenza vaccine in the U.S. during influenza season and then travels to the Southern Hemisphere during their influenza season be protected?
A dose of influenza vaccine might provide some protection to a person during travel to the Southern Hemisphere. The amount of protection would depend on the similarity of circulating viruses to those in the vaccine, and how well the person responded to the vaccine. If the person is at increased risk for complications of influenza (65 years or older, underlying medical or risk factors) it would be prudent to receive influenza vaccine upon arrival in the southern hemisphere if the person will be staying for 2 weeks or longer. Southern hemisphere influenza vaccines are not generally available in northern hemisphere countries.
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