Correct Answer: A. Trichomonas vaginalis
The clinical presentation of foul-smelling frothy vaginal discharge with intense itching and strawberry cervix (punctate hemorrhagic spots on the cervix) is pathognomonic for Trichomonas vaginalis infection. This protozoan parasite causes trichomoniasis, one of the most common curable sexually transmitted infections (STIs) in India. The strawberry cervix appearance results from punctate hemorrhages caused by the organism's mechanical trauma and inflammation of the cervical epithelium. The frothy, foul-smelling discharge is due to gas production by the organism and secondary bacterial overgrowth. T. vaginalis is a flagellated protozoan that thrives in the acidic vaginal environment and causes acute vulvovaginitis. The intense pruritus is characteristic and often the presenting complaint. Diagnosis is confirmed by wet mount microscopy showing motile trophozoites with characteristic jerky movement. Indian guidelines recommend metronidazole 400 mg BD for 7 days as first-line treatment, with partner notification and treatment being essential. The organism is sexually transmitted and can cause urethritis in males, though often asymptomatic.
Why the other options are wrong
B. Neisseria gonorrhoea — While N. gonorrhoea causes cervicitis with purulent discharge and cervical inflammation, it does NOT produce the characteristic strawberry cervix appearance. Gonococcal cervicitis presents with thick, mucopurulent (not frothy) discharge and cervical erythema without punctate hemorrhages. The discharge is typically yellow-green, not frothy. NBE may trap students who associate any STI with cervicitis, but the strawberry cervix is specific to T. vaginalis. C. Candida albicans — Candida causes vulvovaginitis with thick, white, curd-like discharge (not frothy or foul-smelling) and intense itching. While pruritus is present, the discharge character is distinctly different—thick and cottage-cheese-like rather than frothy. Candida does NOT produce strawberry cervix; cervical involvement is minimal. The foul smell and frothy nature are absent in candidiasis, making this a common NBE distractor for students who focus only on 'itching.' D. Gardnerella vaginalis — Gardnerella causes bacterial vaginosis (BV) with a thin, gray-white, homogeneous discharge with a characteristic fishy odor (due to amines), but NOT frothy. BV is not an acute inflammatory condition and does NOT present with strawberry cervix or intense vulvar itching. The cervix appears normal in BV. Diagnosis relies on Amsel criteria (clue cells on wet mount), not motile organisms. This is a classic NBE trap pairing an STI with vaginal discharge without the inflammatory signs.
High-Yield Facts
- Strawberry cervix (punctate hemorrhagic spots) is pathognomonic for Trichomonas vaginalis and distinguishes it from other causes of vaginitis.
- Frothy, foul-smelling discharge with intense pruritus is the classic triad for trichomoniasis; the froth is due to gas production by the organism.
- Metronidazole 400 mg BD × 7 days is the Indian standard DOC; single-dose 2 g is an alternative for compliance.
- Trichomonas is a flagellated protozoan (not bacterium or fungus) that shows jerky motility on wet mount—the gold standard diagnostic test.
- Partner notification and simultaneous treatment are mandatory in trichomoniasis to prevent reinfection; untreated partners remain a source.
- Trichomoniasis is associated with increased risk of adverse pregnancy outcomes (preterm labor, low birth weight) if untreated during pregnancy.
Mnemonics
STRAWBERRY = Trichomonas Strawberry cervix → Trichomonas vaginalis. When you see 'strawberry cervix' in a question, think T. vaginalis immediately. No other organism causes this pathognomonic sign. FROTHY + FOUL = Trichomonas Frothy discharge + Foul smell + Flagellated protozoan = Trichomonas. The froth distinguishes it from candida (curd-like) and BV (homogeneous gray-white). Vaginitis Discharge Mnemonic Trichomonas = Frothy & Foul; Candida = Curd-like & Cottage-cheese; BV (Gardnerella) = Gray-white & Fishy. Use discharge character to narrow the differential in 10 seconds.
NBE Trap
NBE commonly pairs Neisseria gonorrhoea with cervicitis to trap students who focus on 'cervical involvement' without recognizing that gonococcal discharge is purulent (not frothy) and the cervix does not show strawberry appearance. The strawberry cervix is the discriminating sign that rules out all other organisms.
Clinical Pearl
In Indian OPD practice, trichomoniasis is often underdiagnosed because wet mount microscopy is not always performed; many cases are empirically treated as candidiasis. The strawberry cervix sign, when present, should prompt immediate wet mount examination and metronidazole therapy with partner notification—critical for preventing recurrent infections and adverse pregnancy outcomes in endemic populations.
_Reference: DC Dutta's Textbook of Obstetrics & Gynaecology, Ch. 24 (Infections in Gynaecology); Harrison's Principles of Internal Medicine, Ch. 137 (Sexually Transmitted Infections)_