近年来，有文件记载，从西非几个国家回国的旅行者感染了登革热，尤其是3型登革热病毒。

In the recent years, dengue has been documented in travellers returning from several countries in West Africa, and particularly dengue type-3 virus.

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尽管2000年之后主导血清型在DENV - 3和DENV - 2之间交替，但是全部四种登革热病毒血清型一直在循环着。

All four dengue virus (DENV) serotypes were permanently in circulation, though the predominant serotype has alternated between DENV-3 and DENV-2 since 2000.

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