Which parasitic organism is commonly transmitted through sexual contact?

Trichomonas vaginalis is recognized as a sexually transmitted protozoan parasite. It is primarily responsible for trichomoniasis, a common sexually transmitted infection (STI) that affects both men and women, though symptoms are often more pronounced in women. The organism is typically transmitted through direct sexual contact, making it particularly relevant in discussions about sexual health and STIs.

In contrast, the other organisms listed have different transmission routes or do not primarily spread through sexual contact. For instance, Entamoeba gingivalis, while a parasite found in the mouth, is primarily transmitted through oral contact and not considered a sexually transmitted infection. Dientamoeba fragilis, associated with gastrointestinal infections, is generally transmitted through fecal-oral routes and not linked to sexual activity. Diphyllobothrium latum, known as the fish tapeworm, is transmitted through the consumption of raw or undercooked fish, rather than through sexual means. Therefore, Trichomonas vaginalis stands out as the organism with a direct association with sexual transmission.