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太平洋的汤加岛国于1974和1975年发生了二次登革热暴发(分别为Ⅱ型和Ⅰ型)。由于太平洋岛群比较分离、人口少以及动物群有限,故提供了在人口较多和复杂的大陆地区不可能得到的流行病学观察的机会。这二次暴发有助于了解更严重的登革热表现。汤加王国由一百五十多个较小的岛屿组成,其中有三个主要岛群,叫做瓦乌群岛、哈派群岛和汤加塔布岛。多数岛屿在南纬18～22°之间,最邻近的是北面的萨摩亚群岛,西面的斐
The island of Tonga in the Pacific Ocean had a second dengue outbreak (Type II and Type I, respectively) in 1974 and 1975. The relatively isolated Pacific island population, its small population and limited fauna provide an opportunity for epidemiological observations that are not possible in the more populated and complex continents. These two outbreaks help to understand more severe dengue fever manifestations. The Kingdom of Tonga consists of more than 150 smaller islands, of which three are the major island groups known as the Vaucluse, the Hawa Islands and Tongatapu. Most of the islands are between 18-22 ° south latitude, most adjacent to the north Samoa, the west Fiji