A 22-year-old female presents with lower abdominal pain, cervical motion tenderness, and purulent discharge. What empiric antibiotic combination covers the most common pathogens of Pelvic Inflammatory Disease?

Answer and explanation

Correct answer: A. Intramuscular ceftriaxone plus oral doxycycline plus oral metronidazole

  1. Step 1: Pelvic inflammatory disease is an ascending polymicrobial infection primarily caused by Neisseria gonorrhoeae and Chlamydia trachomatis, frequently complicated by anaerobic vaginal flora.
  2. Step 2: CDC guidelines recommend outpatient empiric coverage comprising a single dose of intramuscular ceftriaxone (for gonococcus), oral doxycycline for 14 days (for chlamydia), and oral metronidazole (for anaerobes and bacterial vaginosis).
Answer
Intramuscular ceftriaxone plus oral doxycycline plus oral metronidazole.
Why not the others: Amoxicillin is completely ineffective due to widespread beta-lactamase production in N. gonorrhoeae and lacks efficacy against intracellular Chlamydia. Fluoroquinolone resistance in N. gonorrhoeae is widespread globally, making ciprofloxacin contraindicated as empiric therapy. Vancomycin covers gram-positive cocci but has zero activity against Neisseria, Chlamydia, or anaerobes.

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