Reproduction is by longitudinal fission. The male is the most important transmitter of the infection. T.vaginalis is responsible for vaginitis and urethral discharge.
Symptomatic infection is more common in women during the reproductive period.
Diagnosis is usually obtained by microscopic examination of urine, vaginal or urethral discharge or swabs of prostatic secretions. Flagella, nucleus, axostyle and undullating membrane are visible. Filamentous form of Lactobacillus D derleini is present. Vaginal smear, Giemsa-Romanowski stain.