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a genus of flagellate protozoa parasitic in birds and mammals, including humans. T. ho´minis and T. te´nax are nonpathogenic species found in the human mouth and intestines. T. vagina´lis is found in the vagina and male genital tract and is the cause of trichomoniasis.
Schematic diagram of Trichomonas vaginalis. From Brunzel, 1994.


(trik'ō-mō'nas, trik'ō-mon'as), Although the correct pronunciation of this word is trichom'onas, the pronunciation shown is more commonly heard in the U.S.
A genus of parasitic protozoan flagellates (subfamily Trichomonidinae, family Trichomonadidae) causing trichomoniasis in humans, other primates, and birds. Specificity is more marked for its precise microhabitat than for host species. The genus has been divided into several genera: Trichomonas, Pentatrichomonas, Tetratrichomonas, and Tritrichomonas.
[tricho- + G. monas, single (unit)]


/Tricho·mo·nas/ (-mo´nas) a genus of flagellate protozoa. It includes T. ho´minis, a nonpathogenic human intestinal parasite, T. te´nax, a nonpathogenic species found in the human mouth, and T. vagina´lis, the cause of trichomoniasis.trichomo´nal


a genus of flagellate protozoa that includes many species that are parasitic. Some live in the mouth of humans and are found around carious teeth. Other species are found in the vagina and urethra of women. They are a cause of trichomoniasis.


A genus of parasitic protozoan flagellates causing trichomoniasis.
[tricho- + G. monas, single (unit)]


(trik?o'mo'nas) [? + monas, unit]
Genus of flagellate parasitic protozoa.

Trichomonas hominis

A benign trichomonad found in the large intestine.

Trichomonas tenax

A benign trichomonad that may be present in the mouth.
Enlarge picture

Trichomonas vaginalis

A species found in the vagina that produces discharge. T. vaginalis is fairly common in women, esp. during pregnancy or following vaginal surgery. It is sometimes found in the male urethra and may be transmitted through sexual intercourse. See: illustration; colpitis macularis


T. vaginalis causes persistent burning, redness, and itching of the vulvar tissue associated with a profuse vaginal discharge that may be frothy or malodorous or both. Occasionally, infection with T. vaginalis is asymptomatic.


Metronidazole (Flagyl) is taken orally by the woman and her sexual partner. The drug is contraindicated during the first trimester of pregnancy because of potential damage to the developing fetus; clotrimazole vaginal suppositories provide symptomatic relief during the first 12 weeks of gestation.


Alcohol should not be consumed during metronidazole therapy.


a genus of parasitic protozoan occurring in the digestive and reproductive systems of humans and many other animals.


a genus of flagellate protozoa parasitic in animals, birds, and in humans. Member of the family Trichomonadidae and characterized usually by the presence of a single flagellum.

Trichomonas caballi
found in the colon of horses.
Trichomonas canistomae
found in the mouth of dogs.
Trichomonas equi (syn. Trichomonas faecalis)
Trichomonas equibuccalis
found in the mouth of horses.
Trichomonas felistomae
found in the mouth of cats.
Trichomonas foetus
see tritrichomonasfoetus.
Trichomonas gallinae
found in the upper digestive tract of many birds but mostly in pigeon squabs where it causes avian trichomoniasis.
Trichomonas gallinarum
see tetratrichomonasgallinarum.
Trichomonas hominis
see pentatrichomonashominis.
Trichomonas intestinalis
see pentatrichomonashominis.
Trichomonas macacovaginae
found in the vagina of the rhesus monkey.
Trichomonas phasioni
causes diarrhea and dehydration of pheasant poults.
Trichomonas tenax
found in the mouth of monkeys and humans but has no pathogenic effect.
References in periodicals archive ?
More frequent detection of severe forms of PVI associated with pathogenic microorganisms, chlamydia and trichomonas are likely to be related to the clinical manifestations of overlaying of their symptoms on each other.
APTIMA[R] Trichomonas vaginalis, a transcription-mediated amplification assay for detection of Trichomonas vaginalis in urogenital specimens.
The College of American Pathologists Interlaboratory Comparison Program in Gynecologic Cytology (CAP-PAP) provides a unique opportunity to evaluate whether the use of LBPs has changed the performance of cytotechnologists and pathologists in the identification of Trichomonas infection.
See Prevalence and incidence of selected sexually transmitted infections, Chlamydia trachomatis, Neisseria gonorrhoeae, syphilis and Trichomonas vaginalis.
Trichomonas vaginalis is associated with pelvic inflammatory disease in women infected with human immunodeficiency virus.
We usually think of STDs as more prevalent in young people, but our study results clearly show that with trichomonas, while too many young people have it, even more, older women are infected," said study senior investigator Charlotte Gaydos, DrPH, MS, of the Johns Hopkins University School of Medicine.
With the purpose of searching for new antitrichomonal agents, Xanthium brasilicum Vell and Argemone mexicana L, traditionally used for treatment of clinical signs associated with trichomoniasis such as venereal diseases, were selected to evaluate the activity of their chloroform, methanol and aqueous crude extracts against Trichomonas vaginalis trophozoites in vitro.
The prevalence of chlamydia, gonorrhea, and trichomonas in sexual partnerships: implications for partner notification and treatment.
Chapters are written from a molecular and genomic perspective, with speculative models for future research, and address the genome projects for and cytoskeletons of Entamoeba histolytica, Trichomonas vaginalis, Giardia and other diplomonads; genomic analyses and manipulation of gene expression in Entamoeba histolytica; nuclear and chromosomal structure and replication in Giardia; and the mitochondrion-like organelles of a fourth anaerobe, Blastocystis.
While lateral gene transfer from a trematode worm could ultimately benefit the lake sturgeon, evidence of the Trichomonas pathogen is more likely to have a negative effect.
Now she's told me she has an STI called trichomonas.