Onchocercal infections are found in tropical climates.  About 99% of<unk>  cases occur in Africa. Also, the parasite is found in limited areas in America and in Yemen in the Middle East.
Onchocerciasis epidemiology and demographics
Trichomoniasis epidemiology and demographics
Trichinosis epidemiology and demographics
Leishmaniasis epidemiology and demographics
Filariasis epidemiology and demographics
Isosporiasis epidemiology and demographics
Schistosomiasis epidemiology and demographics
African trypanosomiasis epidemiology and demographics