Parasites and Health [Last Modified: ]
[Trichomonas vaginalis]
Causal Agent Life Cycle Geographic Distribution Clinical Features Laboratory Diagnosis Treatment

Causal Agent:
Trichomonas vaginalis, a flagellate, is the most common pathogenic protozoan of humans in industrialized countries.

Life Cycle:

Life cycle of Trichomonas vaginalis

Trichomonas vaginalis resides in the female lower genital tract and the male urethra and prostate  , where it replicates by binary fission  .  The parasite does not appear to have a cyst form, and does not survive well in the external environment.  Trichomonas vaginalis is transmitted among humans, its only known host, primarily by sexual intercourse  .

Geographic Distribution:
Worldwide.  Higher prevalence among persons with multiple sexual partners or other venereal diseases.


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