Abstract
One of the unusual aspect of the life cycle of Strongyloides stercoralis is the occurrence of autoinfective third-stage larvae (L3a). These are the causative agents of severe hyperinfective strongyloidiasis. When 6-wk-old gerbils are infected with 1,000 infective third-stage larvae (L3i), no L3a are seen during the course of the infection. However, in neonatal gerbils (1-13 days of age) infected with 1,000 L3i, a burst of autoinfection takes place between 15 and 30 days postinfection (PI). Only occasional L3a can be found in neonatally infected gerbils after 4 wk PI. This autoinfective burst is not seen in neonatal gerbils infected with 200 L3i.
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