Trichomoniasis

It is one of the most common sexually transmitted infections, caused by a microscopic, single-celled, flagellated protozoan parasite named Trichomonas vaginalis.

It is transmitted almost exclusively via unprotected vaginal intercourse. The parasite resides in the vulva, vagina, and urethra in females, and within the urethra (urinary tract) in males.

It induces clinical symptoms in approximately half of infected females. The most pathognomonic sign is a yellow-green, frothy vaginal discharge with a highly offensive fishy odor. Intense vulvovaginal pruritus, burning, dysuria (painful urination), and dyspareunia (painful intercourse) are observed.

Even though 70-80% of infected males harbor this protozoan, they experience no physical manifestations (remaining completely asymptomatic). However, they may occasionally encounter mild dysuria, urethral pruritus, or a clear morning discharge. Despite being asymptomatic, they remain infectious and continuously transmit the disease to their partners.

A gynecologist may identify a pathognomonic 'strawberry cervix' (punctate hemorrhages) during speculum examination. Definitive diagnosis is established via laboratory evaluation of a wet mount of vaginal discharge or male urine/urethral swab, looking for motile trichomonads under light microscopy or via highly sensitive PCR assays.

Because the pathogen is a protozoan parasite and not a bacterium, conventional antibiotics or antifungals are entirely ineffective. Treatment consists of specific nitroimidazole antiparasitic agents from the Metronidazole or Tinidazole classes (typically as a single high dose). The Gold Rule: Regardless of whether they are symptomatic or asymptomatic, the sexual partner must swallow this medication CONCURRENTLY. Otherwise, a ping-pong transmission cycle ensues, repeatedly reinfecting one another.