Leishmaniasis is a parasitic disease caused by the Leishmania parasite found in sand flies. leishmania, any of several species of flagellate protists belonging to the genus Leishmania in the order Trypanosomatida. These protists are parasites of vertebrates, to which they are transmitted by species of bloodsucking sand flies in the genera Phlebotomus and Lutzomyia. The leishmanial parasites assume two forms: a round or oval leishmanial stage, which lives and multiplies in the vertebrate host; and an elongate, motile, flagellated organism called a leptomonad, which is found in the ... Leishmaniasis is a parasitic disease transmitted by sandflies and caused by different species of Leishmania. It can cause cutaneous, visceral, or mucosal lesions, depending on the parasite, host, and geographic location. Leishmaniasis is an infection caused by a species of Leishmania. Manifestations include cutaneous, mucosal, and visceral syndromes. Cutaneous leishmaniasis causes chronic skin lesions ranging from nodules to large ulcers that can persist for months to years but eventually heal with scarring. Mucosal leishmaniasis affects nasopharyngeal tissues and can cause gross mutilation of the nose and palate. Visceral leishmaniasis causes irregular fever, hepatosplenomegaly, pancytopenia, and polyclonal ...