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Difficulty: EasyInfectious Diseases

For each clinical presentation described below, select the most appropriate initial antimicrobial agent according to current guidelines.

  • Erythema migrans rash following a tick bite in an endemic regionDoxycycline
  • Painful, grouped vesicles on an erythematous base in a unilateral dermatomal distributionValacyclovir
  • Exudative pharyngitis, fever, and anterior cervical lymphadenopathy with a positive rapid streptococcal antigen testPenicillin V
  • Purulent urethral discharge with a nucleic acid amplification test positive for Neisseria gonorrhoeaeCeftriaxone

Answer

The presentations correspond to Lyme disease (Doxycycline), Herpes zoster (Valacyclovir), Group A Streptococcal pharyngitis (Penicillin V), and Gonococcal urethritis (Ceftriaxone).
Each match correctly pairs a classic infectious disease syndrome with its universally accepted standard-of-care antimicrobial therapy.

Step-by-Step Solution

1
Identify the primary diagnosis for each specific clinical presentation.
The diagnoses are early localized Lyme disease, herpes zoster, streptococcal pharyngitis, and gonorrhea.
Accurate clinical and laboratory diagnosis is required to select the appropriate pathogen-directed therapy.
2
Determine the guideline-recommended first-line antimicrobial for each established diagnosis.
Lyme disease requires doxycycline; herpes zoster requires valacyclovir; streptococcal pharyngitis requires penicillin V; gonorrhea requires ceftriaxone.
First-line agents maximize clinical efficacy while minimizing antimicrobial resistance and side effects.

Key Concept

First-line antimicrobial therapy for common outpatient infectious diseases
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Topics

Infectious Diseases

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