International travel, especially to subtropical countries, appears to contribute to the spread of influenza worldwide, researchers from the Netherlands have found.
“WHO estimates that 5% to 15% of the worldwide population is affected by seasonal influenza viruses annually,” the researchers wrote in Emerging Infectious Disease. “Outbreaks of influenza associated with travel by air, ship or train indicate that international travelers are at risk for this infection and may introduce novel strains into domestic populations.”
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