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Difficulty: HardInfectious Diseases

Match the following specific clinical presentations of infectious diseases with their most appropriate first-line targeted antimicrobial therapy.

  • A 28-year-old pregnant woman at 10 weeks gestation presenting with a 6-cm expanding annular erythematous rash with central clearing after a hiking trip.Oral amoxicillin
  • A 35-year-old man presenting with acute fever, severe headache, and a maculopapular rash that began on his wrists and ankles before spreading centrally.Oral doxycycline
  • A 65-year-old man with chronic lymphocytic leukemia presenting with nuchal rigidity and cerebrospinal fluid analysis revealing Gram-positive bacilli.Intravenous ampicillin
  • A 42-year-old asplenic man presenting with fever, hemolytic anemia, and a peripheral blood smear revealing intraerythrocytic tetrads.Atovaquone and azithromycin

Answer

The correct pairings match each distinct infectious syndrome to its definitive treatment, accounting for patient-specific factors such as pregnancy or immunocompromised status.
Each clinical presentation is matched with its definitive first-line therapy, factoring in critical modifiers such as pregnancy (necessitating amoxicillin for Lyme), age/immunity (necessitating ampicillin for Listeria), and pathognomonic smear findings (dictating atovaquone/azithromycin for Babesia).

Step-by-Step Solution

1
Analyze each clinical vignette to identify the underlying pathogen and disease state.
Identified pathogens: Borrelia burgdorferi (Lyme), Rickettsia rickettsii (RMSF), Listeria monocytogenes (Meningitis), and Babesia microti (Babesiosis).
Accurate pathogen identification is the prerequisite for selecting targeted antimicrobial therapy.
2
Identify patient-specific modifiers that alter standard management.
Identified pregnancy in the Lyme disease patient, necessitating a deviation from standard doxycycline therapy.
Certain physiologic states or comorbidities (like pregnancy or asplenia) dictate alternative drug choices or highlight specific susceptibilities.
3
Pair the disease and patient profile with the guideline-directed first-line antimicrobial.
Matched Lyme in pregnancy with amoxicillin, RMSF with doxycycline, Listeria with ampicillin, and Babesiosis with atovaquone/azithromycin.
Ensures adherence to antibiotic stewardship and optimal patient outcomes.

Key Concept

Targeted antimicrobial selection based on pathogen identification and patient-specific contraindications.
Estimated Time:1m 30s
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Topics

Infectious Diseases

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