travellers were reported annually in Sweden. Over 75 % of cases in 2005-2008 were infected when travelling to Southeast Asia, most if them in Thailand, one of the Swedes ’ most popular holiday destinations. Since 2007, we have observed a 55 % increase in the number of dengue fever cases reported per month, with 17 cases reported in January 2009 alone. The global incidence of dengue fever has increased over the past few years, and there are frequent reports of large outbreaks in Asia and Latin America . It is estimated that 50-100 million people are infected world-wide each year and that approximately 500,000 are hospitalised for treatment . Dengue virus infection is one of the most common causes of fever in travellers to countries in th
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