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Introduction
Francisco G. Bravo Protozoa and Worms 83
Key features
ยProtozoa are responsible for many tropical diseases that not only affect large regions of the world but also can have different clinical presentations in the Old World versus the New World (e.g.ย leishmaniasis)
ยProtozoal infections can lead to significant morbidity in both immunocompromised hosts (e.g. toxoplasmosis) and immunocompetent individuals (e.g. Balamuthia spp.)
ยWorms (helminths) are common parasites with a worldwide distri- bution; cutaneous manifestations vary considerably, from pruritus ani to elephantiasis
ยEven helminthic diseases with a restricted geographic distribution, such as onchocerciasis and echinococcosis, may be observed in individuals from non-endemic areas due to immigration, tourism, disaster relief efforts, or military service