Trichomas is a parasite which usually cause vaginitis in female.

1. Trichomonas
Dr. Saiful Alam
Lecturer, Microbiology
Shaheed Tajuddin Ahmad Medical College

2. Morphology
• Trichomonas are common flageolets of the tropical zone.
• Exists only in trophozoite phase without the cystic phase.
• The single ovoid nucleus is seen at the round anterior end and a cleft like depression
(cytostome) lies at its side.
• Has 3-5 anterior flagella that are free.
• A thicker flagella passes backwards along the side of the body forming the undulating
membrane and come out free at the pointed posterior end.
• The axostyle runs down the middle of the body and ends at the pointed tail like
extremity.

4. Classification of trichomonas
• According to habitat, trichomonas is classified as:
o Pentatrichomonas hominis: Inhabiting in the ileo-caecal region.
o Trichomonas tinax: inhabiting in the oral cavity.
o Trichomonas vaginalis: Inhabiting in vagina.

5. Trichomonas vaginalis

6. Morphology
• It is a pear-shaped organism with a central nucleus and four anterior flagella.
• The undulating membrane extends about two-thirds of its length.
• It exists only as a trophozoite form.
• Transmission is by sexual intercourse.
Habitat
• It is found in the female genital tract.
• Also found in urinary tract of both male and female.
Diseases
• Vaginitis
• Urethritis in both male and female.