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Dengue fever is common to Thailand, especially during the rainy season, which runs from May to October. There has been a significant increase in the number of Dengue fever cases in the first half of 2008 compared to the same period in 2007 (31,226 cases in 2008, resulting in 27 deaths, compared to 21,251 cases in 2007, which resulted in 17 deaths). Rayong Province is among the areas worst affected, in August 2008 the Rayong provincial administration declared the Province a Dengue fever disaster zone. There is no vaccination against Dengue, but there are preventative measures that you can take, as advised on the National Travel Heath Network and Centre (NaTHNaC) website.