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Trichomonas vaginalis

Written by the Fiveable Content Team • Last updated August 2025
Written by the Fiveable Content Team • Last updated August 2025

Definition

Trichomonas vaginalis is a flagellated protozoan parasite that is the causative agent of trichomoniasis, a common sexually transmitted infection affecting the urogenital system.

Trichomonas vaginalis cheat sheet for homework

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5 Must Know Facts For Your Next Test

  1. Trichomonas vaginalis is a flagellated, anaerobic protozoan that can survive in the human urogenital tract.
  2. Trichomoniasis is one of the most common curable sexually transmitted infections, with an estimated 276 million new cases worldwide each year.
  3. The infection is more common in women, with an estimated prevalence of 3-5% in the general population, but it can also occur in men.
  4. Symptoms of trichomoniasis in women include a foul-smelling, frothy, yellow-green vaginal discharge, vaginal irritation, and discomfort during sexual intercourse.
  5. Trichomoniasis is associated with an increased risk of acquiring and transmitting HIV, as well as adverse pregnancy outcomes, such as preterm birth and low birth weight.

Review Questions

  • Describe the key features of Trichomonas vaginalis and its role in the urogenital system.
    • Trichomonas vaginalis is a flagellated protozoan parasite that is the causative agent of trichomoniasis, a common sexually transmitted infection affecting the urogenital system. It is an anaerobic organism that can survive and thrive in the human urogenital tract, particularly the vagina in women and the urethra in both men and women. Trichomoniasis is one of the most prevalent curable STIs, with an estimated 276 million new cases worldwide each year, and it is more common in women, with a prevalence of 3-5% in the general population.
  • Explain the clinical manifestations and potential complications associated with Trichomonas vaginalis infection.
    • Trichomoniasis caused by Trichomonas vaginalis can lead to a range of clinical symptoms, particularly in women. The most common symptom is a foul-smelling, frothy, yellow-green vaginal discharge, accompanied by vaginal irritation and discomfort during sexual intercourse. While men often exhibit no symptoms, they can still transmit the infection to their partners. Importantly, trichomoniasis is associated with an increased risk of acquiring and transmitting HIV, as well as adverse pregnancy outcomes, such as preterm birth and low birth weight. These potential complications underscore the importance of timely diagnosis and effective treatment of Trichomonas vaginalis infections.
  • Discuss the public health significance of Trichomonas vaginalis infections and the strategies for prevention and control.
    • Trichomonas vaginalis infections have significant public health implications due to their high prevalence and the associated health risks. As one of the most common curable sexually transmitted infections, trichomoniasis can facilitate the transmission of HIV and contribute to adverse pregnancy outcomes. To address this public health concern, strategies for prevention and control should focus on improving access to diagnostic testing, promoting safe sexual practices, and ensuring timely and effective treatment of infected individuals. Additionally, educating the public about the risks and symptoms of trichomoniasis can help reduce the spread of this infection and mitigate its impact on individual and community health.
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