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Difficulty: EasyInfectious Diseases

For each of the following patients, select the most appropriate targeted antimicrobial therapy based on current clinical guidelines and stewardship principles.

  • A 25-year-old non-pregnant man presents with an expanding, annular erythematous rash with central clearing after a hiking trip.Oral doxycycline
  • A 28-year-old woman in her first trimester of pregnancy presents with an isolated erythema migrans rash.Oral amoxicillin
  • A 35-year-old man presents with purulent urethral discharge; nucleic acid amplification testing is positive for Neisseria gonorrhoeae and negative for Chlamydia trachomatis.Intramuscular ceftriaxone monotherapy
  • A 19-year-old with active infectious mononucleosis requires treatment for a confirmed concurrent Group A streptococcal pharyngitis.Oral penicillin V

Answer

The non-pregnant patient with Lyme receives oral doxycycline. The pregnant patient with Lyme receives oral amoxicillin. The patient with isolated gonorrhea receives intramuscular ceftriaxone monotherapy. The patient with EBV and streptococcal pharyngitis receives oral penicillin V.
Each specific clinical scenario requires a nuanced selection of antibiotics. Non-pregnant patients with early Lyme disease receive doxycycline. Pregnant patients with early Lyme must avoid tetracyclines and receive amoxicillin instead. Uncomplicated, isolated gonococcal infection is now treated with ceftriaxone alone to promote antibiotic stewardship (sparing azithromycin). Finally, treating streptococcal pharyngitis in a patient with infectious mononucleosis requires penicillin V to avoid the characteristic aminopenicillin-induced rash.

Step-by-Step Solution

1
Identify the underlying infectious etiology for each clinical presentation.
Diagnoses identified: 1) Early Lyme disease. 2) Early Lyme disease in pregnancy. 3) Isolated gonococcal urethritis. 4) Streptococcal pharyngitis with concurrent Epstein-Barr virus.
Accurate diagnosis is required before selecting empiric or targeted therapy.
2
Apply patient-specific contraindications and current antimicrobial stewardship guidelines.
Avoid doxycycline in pregnancy, avoid amoxicillin in EBV, and avoid dual therapy for gonorrhea when chlamydia is negative.
Standard therapies often require adjustment based on age, pregnancy status, concurrent infections, and updated stewardship protocols.
3
Match each tailored regimen to the correct patient scenario.
Matches established correctly based on optimized safety and efficacy.
Ensures the patient receives the most appropriate, narrow-spectrum, and safe antimicrobial.

Key Concept

First-line antimicrobial selection and stewardship in common infectious diseases
Estimated Time:1m 0s
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Topics

Infectious Diseases

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