(leishmania) A genus of flagellate protozoa comprising several species that are pathogenic for humans. Organisms of this genus have an amastigote and a promastigote stage in their life cycles. As a result of enzymatic studies this single genus has been divided into two subgenera: Leishmania leishmania and Leishmania viannia. Species within the Leishmania leishmania subgenus include: L. aethiopica, L. arabica, L. donovani, L. enrietti, L. gerbilli, L. hertigi, L. infantum, L. major, L. mexicana, and L. tropica. The following species are those that compose the Leishmania viannia subgenus: L. braziliensis, L. guyanensis, L. lainsoni, L. naiffi, and L. shawi.

(leishmania) A genus of parasitic trypanosomatid protozoa in the family Trypanosomatidae. These parasites are transmitted by the bite of a sand fly and they are causative for leishmaniasis.

(leishmania) Genus of flagellate protozoa comprising several species that are pathogenic for humans; organisms have an amastigote and a promastigote stage in their life cycles; genus has been divided into two subgenera: Leishmania leishmania and Leishmania viannia.