Crenosoma vulpis Homepage
Common name: Fox lungworm
The adult worm measures less than 16 mm long. The cuticle of the anterior end of the this worm is thrown into crenated folds as seen in this photomicrograph of a portion of the worm recovered by a tracheal wash.
The first stage-larva penetrates the intermediate host (a snail or slug). The larva molts twice and by 17 days post-infection becomes a third stage-larva. The third stage-larva remains in the snail's tissues until the snail is eaten by a definitive host. The third stage-larva makes its way to the lungs and develops to the adult stage in the bronchi and bronchioles. The female worm lays live first stage-larvae, which are carried up the trachea, are swallowed and pass out with the feces. The prepatent period is about 19 days.
Photomicrographs of L1 from tracheal wash
Common Diagnostic Test
© University of Pennsylvania 2004
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