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Difficulty: MediumGynecologic Infections

Match each patient's clinical presentation and examination findings to the most likely etiologic pathogen responsible for their symptoms.

  • A 31-year-old woman describes severe vulvar pruritus and erythema. Pelvic examination reveals a thick, adherent, cottage cheese-like vaginal discharge. The vaginal pH is 4.2.Candida albicans
  • A 29-year-old woman notes a bothersome, 'fishy' smelling vaginal discharge that is more pronounced after menses. Examination shows a thin, homogeneous, grayish-white discharge coating the vaginal walls. The vaginal pH is 5.5.Gardnerella vaginalis
  • A 36-year-old woman experiences dysuria and a copious, frothy yellowish-green discharge. Speculum examination demonstrates punctate hemorrhages on the cervix. The vaginal pH is 6.5.Trichomonas vaginalis
  • A 23-year-old woman is seen for spotting that occurs exclusively after intercourse. Vaginal examination shows a friable cervix with mucopurulent exudate at the external os, but normal-appearing vaginal mucosa. The vaginal pH is 4.0.Chlamydia trachomatis

Answer

The presentations correctly map as follows: 31-year-old with thick discharge matches Candida albicans; 29-year-old with fishy odor matches Gardnerella vaginalis; 36-year-old with frothy discharge matches Trichomonas vaginalis; 23-year-old with postcoital spotting matches Chlamydia trachomatis.
Each pathogen creates a distinct clinical syndrome. Candida albicans thrives in a normal acidic environment and causes thick, clumpy discharge with severe pruritus. Gardnerella vaginalis disrupts the normal flora, raising the pH and causing a thin, fishy-smelling discharge. Trichomonas vaginalis is a motile protozoan that causes significant inflammation (strawberry cervix), elevated pH, and frothy green discharge. Chlamydia trachomatis specifically infects the cervical columnar epithelium, leading to mucopurulent discharge, friability, and postcoital bleeding without altering the vaginal pH.

Step-by-Step Solution

1
Evaluate the vaginal pH for each clinical scenario.
pH is normal (3.8-4.5) in the patients with thick white discharge and postcoital spotting. pH is elevated (> 4.5) in the patients with fishy odor and frothy discharge.
Vaginal pH is a critical distinguishing factor; it remains normal in yeast infections and cervicitis, but becomes elevated in bacterial vaginosis and trichomoniasis.
2
Analyze discharge characteristics and specific physical exam findings.
Cottage-cheese discharge points to yeast; homogeneous gray discharge points to bacterial vaginosis; frothy green discharge with punctate hemorrhages points to trichomoniasis; cervical friability with mucopus points to cervicitis.
Pathognomonic signs such as a 'strawberry cervix' or 'cottage cheese' discharge directly link the clinical presentation to the etiologic organism.
3
Differentiate vaginitis from cervicitis.
The patient with a friable cervix and normal vaginal mucosa has cervicitis (Chlamydia), distinct from the other three who have forms of vaginitis.
Cervicitis pathogens (Chlamydia, Gonorrhea) do not alter vaginal pH and primarily cause cervical inflammation and bleeding, whereas vaginitis pathogens alter the vaginal discharge itself.

Key Concept

Diagnosis and differentiation of common gynecologic infections based on clinical symptoms, vaginal pH, and physical examination findings.
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Topics

Gynecologic Infections

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