D.<unk>  is most commonly found in the subtropic to tropical regions, especially in India, south-west Asia (Iraq, Iran, Pakistan, etc.), and rural areas of Africa, where temperatures between 25 and 30 °C are best for larval development. The parasite relies on people accidentally consuming microcrustaceans of the genus Cyclops (copepods), that dwell in stationary bodies of water such as ponds, large, open wells (with stairs), or rain-filled cisterns. The infection occurs most during times of drought or the "dry-season" in humid climates, or during or just after the rain season in the "semiarid, wet-and-dry-climates". This is due to the lower surface water of the stationary bodies of water, which are prime for the growth of the infected copepods, and main source of water for many.
Dracunculus medinensis
Craniopagus parasiticus
Schistosoma intercalatum
Echinostoma revolutum
Schistosoma mekongi
Ancylostoma tubaeforme
Antihecticum poterii
Schistosoma malayensis