A patient presents with a thin, white, malodorous vaginal discharge. What is the most likely diagnosis?

A patient presents with a thin, white, malodorous vaginal discharge. What is the most likely diagnosis?

• A. Trichomoniasis
• B. Monilia
• C. Bacterial vaginosis
• D. Chlamydia

Answer: (C)

Recognizing patterns of vaginal discharge helps differentiate common infections. Bacterial vaginosis occurs when the normal lactobacillus-dominated flora is disrupted and replaced by mixed anaerobes. This shift produces a thin, white or grayish discharge that often has a fishy odor, especially after a whiff test with potassium hydroxide, and the vaginal pH is typically above 4.5. The discharge is usually not thick or curdlike, and itching may be mild or absent. This presentation best fits bacterial vaginosis because the key features are a thin, malodorous discharge rather than a thick, itchy, cottage-cheese-like discharge seen with candidiasis or a frothy, yellow-green discharge with itching seen with trichomoniasis. Chlamydia can cause mucopurulent discharge but is not characteristically malodorous or described as thin and white.

Recognizing patterns of vaginal discharge helps differentiate common infections. Bacterial vaginosis occurs when the normal lactobacillus-dominated flora is disrupted and replaced by mixed anaerobes. This shift produces a thin, white or grayish discharge that often has a fishy odor, especially after a whiff test with potassium hydroxide, and the vaginal pH is typically above 4.5. The discharge is usually not thick or curdlike, and itching may be mild or absent.

This presentation best fits bacterial vaginosis because the key features are a thin, malodorous discharge rather than a thick, itchy, cottage-cheese-like discharge seen with candidiasis or a frothy, yellow-green discharge with itching seen with trichomoniasis. Chlamydia can cause mucopurulent discharge but is not characteristically malodorous or described as thin and white.