Definition: the whipworm of humans, a species that causes trichuriasis; the body is filiform and slender in the anterior three fifths, and more robust posteriorly; females are 4 or 5 cm long, males are shorter (with coiled caudal extremity and a single eversible spicule); eggs are barrel-shaped, 50–56 mcm by 20–22 mcm, with double shell and translucent knobs at each of the two poles; humans are the only susceptible hosts and usually acquire infection by direct finger-to-mouth contact or by ingestion of soil, water, or food that contains larvated eggs (development in the soil takes 3–6 weeks under proper conditions of warmth and moisture, hence distribution is chiefly tropical); larvae escape from eggs in the ileum, mature in approximately a month, and then pass directly into the cecum without undergoing a parenteral migration as occurs with Ascaris lumbricoides; adults may persist for 2–7 years.
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