Creamy white watery discharge with fishy odour from vagina along with minimal itching is due to:
**Core Concept**
Trichomonas vaginalis infection is a sexually transmitted disease (STD) that causes vaginitis, a condition characterized by inflammation of the vagina, often accompanied by a characteristic creamy white watery discharge.
**Why the Correct Answer is Right**
The pathogenesis of Trichomonas vaginalis infection involves the adherence of the parasite to the vaginal epithelial cells, leading to an inflammatory response. The presence of the parasite and its associated inflammatory mediators cause the release of a characteristic creamy white watery discharge. The discharge has a distinctive fishy odor due to the presence of volatile amines produced by the breakdown of the bacterial flora in the vagina. The minimal itching associated with Trichomonas vaginalis infection is thought to be due to the release of histamine and other inflammatory mediators.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because Bacterial vaginosis (BV) typically presents with a thin, white or gray discharge without a strong fishy odor. While BV can cause itching, the discharge and odor characteristics are distinct from those of Trichomonas vaginalis infection.
**Option B:** This option is incorrect because Candida albicans infection typically presents with a thick, white, cottage cheese-like discharge with minimal odor. The discharge is often accompanied by significant itching and burning.
**Option C:** This option is incorrect because Chlamydia trachomatis infection typically presents with a mucopurulent discharge, often accompanied by pelvic inflammatory disease (PID) symptoms such as lower abdominal pain and dysuria.
**Option D:** This option is incorrect because Gardnerella vaginalis infection is a type of bacterial vaginosis and would present with a thin, white or gray discharge without a strong fishy odor.
**Clinical Pearl / High-Yield Fact**
The "whiff test" is a simple and effective way to diagnose Trichomonas vaginalis infection: a pH indicator strip is dipped into the discharge, and if it turns yellow or red, it suggests the presence of the parasite.
**Correct Answer:** C.