Match each clinical presentation requiring targeted or empiric antimicrobial therapy with the most appropriate guideline-concordant oral antibiotic regimen.
- A 32-year-old pregnant woman (9 weeks gestation) with an expanding, targetoid erythematous rash on her thigh one week after hiking in a wooded area.Oral amoxicillin
- A 27-year-old veterinary technician with rapidly progressive pain, swelling, and erythema of the hand 18 hours after a deep puncture wound from a cat.Oral amoxicillin-clavulanate
- A 55-year-old man with acute onset of fever and a sharply demarcated, bright red, warm, tender plaque on his lower leg without purulent drainage.Oral cephalexin
- A 38-year-old woman with a 2-day history of frequent bloody stools, severe abdominal cramping, and low-grade fever following a trip to Southeast Asia.Oral azithromycin
Answer
The correct matches are: the pregnant patient with Lyme disease requires oral amoxicillin; the cat bite requires oral amoxicillin-clavulanate; the non-purulent cellulitis requires oral cephalexin; and the bloody traveler's diarrhea requires oral azithromycin.
Each clinical scenario presents a distinct infectious syndrome with specific first-line antimicrobial recommendations based on pathogen probability and host factors. The pregnant patient with Lyme disease requires amoxicillin to avoid doxycycline teratogenicity. The cat bite requires amoxicillin-clavulanate for optimal Pasteurella and anaerobe coverage. Non-purulent cellulitis is adequately treated with cephalexin to cover streptococcal species. Severe traveler's diarrhea from Southeast Asia requires azithromycin due to high rates of regional fluoroquinolone resistance.
Step-by-Step Solution
Key Concept
Selection of empiric and targeted antimicrobial therapy requires integrating the most likely pathogen based on the clinical syndrome and exposure history with patient-specific factors such as pregnancy and local resistance patterns.