Onchocerciasis and Lymphatic Filariasis
Infections with parasitic worms are widespread in tropical and sub-tropical areas of the world. In particular, infections with filarial nematodes occur in hot climate zones including lymphatic filariasis, onchocerciasis and loiasis; Mansonella species which occur in parts of Central Africa and Central and South America usually cause mild clinical symptoms. All filarial infections are transmitted by flying insects; humans are the only reservoir. Throughout the hot climate zones in Africa, approximately 130–150 million people are affected; the prevalence has clear association with poverty. Despite ongoing control programmes, lymphatic filariasis and onchocerciasis have been included in the list of neglected tropical diseases (NTD) by the WHO.
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