Yellow fever and dengue: a threat to Europe?

The introduction and rapidly expanding range of Aedes albopictus in Europe is an iconic example of the growing risk of the globalization of vectors and vector-borne diseases. The history of yellow fever and dengue in temperate regions confirms that transmission of both diseases could recur, particularly if Ae. aegypti, a more effective vector, were to be re-introduced. The article is a broad overview of the natural history and epidemiology of both diseases in the context of these risks.