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Difficulty: HardInfectious Diseases

Various parasitic infections require specific antimicrobial agents based on their pathogenesis and the patient's clinical syndrome. For each patient vignette described below, select the most appropriate definitive treatment regimen.

  • A 45-year-old agricultural worker from South America presenting with progressive dysphagia, severe constipation, and right bundle branch block on electrocardiogram.Benznidazole
  • A 32-year-old male traveler presenting with painless terminal hematuria and chronic dysuria months after swimming in freshwater lakes in sub-Saharan Africa.Praziquantel
  • A 60-year-old immunosuppressed host on chronic systemic glucocorticoids who rapidly develops recurrent enteric gram-negative bacteremia and a rapidly advancing serpiginous perianal rash.Ivermectin
  • A 29-year-old immigrant from rural Central America presenting with new-onset focal seizures; brain magnetic resonance imaging shows multiple cysts with distinct internal dots (scolices).Albendazole and dexamethasone
  • A 35-year-old aid worker returning from South Asia presenting with weeks of irregular fever, profound weight loss, massive hepatosplenomegaly, and pancytopenia.Liposomal amphotericin B

Answer

The clinical presentations match with their respective targeted therapies: Chagas disease with benznidazole, urinary schistosomiasis with praziquantel, Strongyloides hyperinfection with ivermectin, neurocysticercosis with albendazole and dexamethasone, and visceral leishmaniasis with liposomal amphotericin B.
The correct matches align specific parasitic pathogen profiles with their guideline-directed therapies. Trypanosoma cruzi causes Chagas disease (cardiomyopathy, achalasia, megacolon) and is treated with benznidazole. Schistosoma haematobium causes urinary schistosomiasis and is treated with praziquantel. Strongyloides stercoralis can cause a hyperinfection syndrome in immunosuppressed hosts, treated with ivermectin. Taenia solium causes neurocysticercosis, which must be treated with both albendazole and corticosteroids like dexamethasone to prevent severe localized inflammation. Visceral leishmaniasis presents with systemic signs (fever, hepatosplenomegaly, pancytopenia) and is treated with liposomal amphotericin B.

Step-by-Step Solution

1
Analyze each vignette to identify the underlying parasitic pathogen based on geographic exposure and clinical findings.
Identified Trypanosoma cruzi, Schistosoma haematobium, Strongyloides stercoralis, Taenia solium, and Leishmania species respectively.
Accurate pathogen identification is required to select the targeted antimicrobial therapy.
2
Select the first-line pharmacotherapy for each identified organism.
Benznidazole (Chagas), Praziquantel (Schistosomiasis), Ivermectin (Strongyloides), Albendazole with dexamethasone (Neurocysticercosis), and Liposomal amphotericin B (Leishmaniasis).
Anti-parasitic agents are highly specific to the organism's class (e.g., nematodes vs. trematodes vs. protozoa) and clinical severity.
3
Match the clinical vignettes with their corresponding correct therapies.
All five clinical presentations are correctly paired with their definitive treatment regimens.
This completes the requirements of the matching task based on current infectious disease guidelines.

Key Concept

Diagnosis and targeted antimicrobial therapy for systemic and tissue-invasive parasitic infections.
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Topics

Infectious Diseases

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