Candidal Vulvovaginitis and Trichomoniasis are easy to mix up on the boards. Here's a side-by-side comparison — presentation, workup, imaging, and first-line treatment — drawn from our full outlines.
Candidal Vulvovaginitis vs Trichomoniasis at a glance
Candidal Vulvovaginitis: Yeast infection of the vulva/vagina — thick white discharge, intense pruritus, normal pH.
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Question 1ReproductiveMedium
A 28-year-old woman presents with 4 days of intense vulvar itching, burning, and a thick white discharge after finishing a course of amoxicillin 1 week ago. She is not pregnant and uses condoms for contraception. On exam, the vulva is erythematous and edematous with excoriations, and adherent white plaques are noted on the vaginal walls. There is no fishy odor, and the vaginal pH is 4.0. Microscopy of the vaginal secretions is performed. Which of the following findings best supports the most likely diagnosis?
AMotile flagellated protozoa on saline wet mount
BSheets of neutrophils without visible organisms
CBudding yeast and pseudohyphae on KOH wet mount
DEpithelial clue cells seen on saline wet mount
Reveal answer & full explanation
Correct answer: C — Budding yeast and pseudohyphae on KOH wet mount
AMotile flagellated protozoa on saline wet mount
BSheets of neutrophils without visible organisms
CBudding yeast and pseudohyphae on KOH wet mount✓
DEpithelial clue cells seen on saline wet mount
Why Budding yeast and pseudohyphae on KOH wet mount is correct
The picture of recent antibiotic use, intense pruritus, vulvar erythema/edema, thick odorless white plaques, and a normal pH of 4.0 is classic for candidal vulvovaginitis.
A 10% KOH preparation lyses epithelial cells and reveals budding yeast and pseudohyphae of Candida albicans, directly confirming the suspected organism.
Normal pH (less than 4.5) plus KOH yeast/pseudohyphae is diagnostic; recurrent disease prompts a fasting glucose or A1c.
Why the others are wrong
Motile flagellated protozoa on saline wet mount — Motile trichomonads indicate trichomoniasis, which produces a frothy yellow-green discharge and a pH greater than 4.5, not the findings here.
Epithelial clue cells seen on saline wet mount — Clue cells are epithelial cells studded with bacteria and are the hallmark of bacterial vaginosis, which has a pH greater than 4.5 and a fishy odor.
Sheets of neutrophils without visible organisms — A purely inflammatory smear is nonspecific and, absent demonstrable yeast or pseudohyphae, does not support Candida over other causes of vulvovaginitis.
Question 2ReproductiveMedium
A 26-year-old woman presents with 5 days of frothy, malodorous yellow-green vaginal discharge, vulvar itching, and burning with urination. She is not pregnant and has had two new partners in the past 2 months. On speculum exam there is vaginal erythema and punctate cervical hemorrhages. Vaginal pH is 5.5, and saline wet mount shows motile, pear-shaped flagellated organisms. Which of the following is the most appropriate initial management?
AMetronidazole 250 mg orally three times daily for 7 days
BMetronidazole 500 mg orally twice daily for 7 days
CMetronidazole 2 g orally as a single one-time dose
DMetronidazole 0.75% vaginal gel nightly for 5 days
Reveal answer & full explanation
Correct answer: B — Metronidazole 500 mg orally twice daily for 7 days
AMetronidazole 250 mg orally three times daily for 7 days
BMetronidazole 500 mg orally twice daily for 7 days✓
CMetronidazole 2 g orally as a single one-time dose
DMetronidazole 0.75% vaginal gel nightly for 5 days
Why Metronidazole 500 mg orally twice daily for 7 days is correct
The frothy yellow-green discharge, strawberry cervix (punctate hemorrhages), pH >4.5, and motile flagellated trichomonads on wet mount confirm Trichomonas vaginalis vaginitis.
Per CDC 2021 STI treatment guidelines, first-line therapy for women is metronidazole 500 mg PO BID for 7 days; this multidose regimen replaced the single 2 g dose in women because the 7-day course produces lower recurrence.
Sexual partners should also be treated, and the patient should be re-tested within 3 months given high reinfection rates.
Why the others are wrong
Metronidazole 2 g orally as a single one-time dose — correct drug class, but the single dose is now first-line only for men; in women it has higher recurrence and is no longer preferred.
Metronidazole 250 mg orally three times daily for 7 days — a superseded lower-dose oral regimen that delivers less total drug than the currently recommended course; CDC specifies 500 mg twice daily for 7 days in women.
Metronidazole 0.75% vaginal gel nightly for 5 days — topical metronidazole treats bacterial vaginosis but does not reach therapeutic levels in the urethra and periurethral glands where trichomonads persist, so cure rates are poor and it is explicitly not recommended for trichomoniasis.
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Woman after antibiotic use with severe vulvar itching, vulvar erythema, thick curd-like discharge, normal pH, and yeast/pseudohyphae on KOH prep.; Intense vulvar and vaginal pruritus (hallmark); Burning, soreness, irritation; External dysuria (urine contacting inflamed vulva); Dyspareunia; Thick white 'cottage cheese' discharge —…
Sexually active woman with frothy malodorous discharge, vulvar pruritus, and strawberry cervix on colposcopy or speculum exam.; Frothy, malodorous yellow-green discharge; Vulvar and vaginal pruritus, burning; Dyspareunia, dysuria; Postcoital bleeding; ~50% of women and most men are asymptomatic; Frothy yellow-green discharge;…
Workup / key labs
Vaginal pH normal (<4.5) — important distinguishing feature; 10% KOH wet mount: budding yeast, pseudohyphae (C. albicans) or budding yeast without pseudohyphae (C. glabrata); Negative whiff test; Culture if recurrent, severe, or atypical (identifies non-albicans species and resistance); Fasting glucose or A1c if recurrent — screen for…
NAAT (nucleic acid amplification test) — preferred; high sensitivity/specificity; Wet mount microscopy — motile, pear-shaped flagellated trichomonads (~50-70% sensitivity); Point-of-care antigen tests (OSOM Trichomonas, Affirm VPIII) — better than wet mount, suitable for clinical setting; Culture (Diamond medium) — high specificity but…
First-line treatment
Uncomplicated: fluconazole 150 mg PO × 1 dose; Topical azole alternatives × 1-7 days: clotrimazole, miconazole, terconazole, tioconazole (available OTC); Patient symptom relief usually within 24-48 hours; Prefer a topical azole when oral fluconazole poses QT-prolongation or drug-interaction risk (e.g., other QT-prolonging drugs,…
Women: metronidazole 500 mg PO BID × 7 days (CDC 2021 — replaced single 2 g dose for women based on trial data showing lower recurrence with 7-day regimen); Men: metronidazole 2 g PO × 1 dose; Alternative: tinidazole 2 g PO × 1 dose
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