This scenario tests the understanding of post-infectious sequelae versus treatment failure. The drug Protozole-X, which inhibits PFOR (like nitazoxanide), appears to have successfully eradicated the Giardia infection, as evidenced by negative stool antigen tests and no trophozoites on biopsy. However, the patient continues to have symptoms (bloating, steatorrhea) and objective findings of villous atrophy. The most likely explanation is post-giardiasis lactose intolerance and malabsorption syndrome. Giardia infection damages the intestinal brush border, leading to deficiency of disaccharidases like lactase. This can persist for weeks or months after parasite clearance, as the intestinal mucosa takes time to regenerate. The ongoing villous atrophy on biopsy supports this. The symptoms are not due to drug failure (B), as the parasite is cleared. Autoimmune enteropathy (C) is rare and not typical post-giardiasis. Bacterial overgrowth (D) can occur but would not explain the persistent villous atrophy; it's more a consequence of dysmotility.

Break down complex topics into smaller, manageable chunks for easier recall.

Zambia

• Joseph Soko – 101 pts

• Visual Pathway Lesions
• Positive and Negative Symptoms
• Hallucinations and Delusions
• Antipsychotic Medications
• Emergency: Environmental Emergencies