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Figure 1. Strongyloides stercoralis infection occurs when filariform larvae from the soil penetrate the skin, pass through the circulation to the lungs, enter the airways, and are then swallowed. In the small-intestinal mucosa, the larvae mature into adults (Panel A, long arrow) and deposit eggs that release first-stage rhabdoid larvae (Panel A, short arrow; hematoxylin and eosin, x105). These larvae are the usual diagnostic feature in the stool specimen (Panel B; iodine stain, x505) and are identified by their short buccal cavity (long arrow) and prominent genital primordium (short arrow).
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