Strongyloidiasis and Other Tissue Nematodes

Strongyloidiasis, caused by Strongyloides stercoralis, is a unique and potentially fatal soil-transmitted helminth infection due to its capacity for autoinfection and hyperinfection in immunocompromised hosts. This advanced topic in parasitology is critical for tertiary students in medicine and laboratory science in Zambia. The module covers the complex life cycle, which includes free-living and parasitic generations, and the dangerous autoinfective cycle that can lead to lifelong persistence and overwhelming dissemination. Students will learn about the clinical spectrum, from mild cutaneous and gastrointestinal symptoms to fatal hyperinfection syndrome, particularly in patients on corticosteroids or with HTLV-1 infection. Diagnosis is challenging and involves specialized stool examinations (Baermann technique), serology, and molecular methods. The topic also introduces other tissue nematodes like Trichinella spiralis. Understanding Strongyloides is paramount for safe immunosuppressive therapy and managing patients in endemic areas. Excelling in this topic demonstrates the ability to handle complex parasitic life cycles and their severe clinical implications, a key skill for advanced clinical practice.