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Two trophozoites of "Trichomonas vaginalis" stained with Giemsa
Two trophozoites of Trichomonas vaginalis stained with Giemsa
Scientific classification e
Domain: Eukaryota
(unranked): Parabasalia
Order: Trichomonadida
Brugerolle & Lee 2000

Trichomonadida is an order of anaerobic protists, included with the parabasalids. Members of this order are referred to as trichomonads.

Some organisms in this order include:


Species in this order typically have four to six flagella at the cell's apical pole, one of which is recurrent - that is, it runs along a surface wave, giving the aspect of an undulating membrane. Like other parabasalids, they typically have an axostyle, a pelta, a costa, and parabasal bodies. In Histomonas only one flagellum and a reduced axostyle are found, and in Dientamoeba, both are absent.


Most species are either parasites or other endosymbionts of animals.

Trichomonads reproduce by a special form of longitudinal fission, leading to large numbers of trophozoites in a relatively short time. Cysts never form, so transmission from one host to another is always based on direct contact between the sites they occupy.


The preferred treatment for trichomonad infection is Metronidazole.[1]

Further reading[edit]

  • Kamaruddin, Mudyawati; Tokoro, Masaharu; Rahman, Md. Moshiur; Arayama, Shunsuke; Hidayati, Anggi P.N.; Syafruddin, Din; Asih, Puji B.S.; Yoshikawa, Hisao; Kawahara, Ei (2014). "Molecular Characterization of Various Trichomonad Species Isolated from Humans and Related Mammals in Indonesia". The Korean Journal of Parasitology. 52 (5): 471–478. doi:10.3347/kjp.2014.52.5.471. PMC 4210728. PMID 25352694.


  1. ^ PreTest Pharmacology (14 ed.). p. 221.

External links[edit]