Incubation
In humans, there can be an up to six week incubation period for worm development and symptoms may not appear until the second molting of the worm, in which the young adult worms begin migration from the esophagus to the buccal and oral palate tissue. It is this movement through the mucosa of the mouth and lips that causes patients to complain of symptoms. Gongylonema pulchrum burrows in the mucosal lining of the esophagus and other parts of the buccal cavity. There the 14 cm (5.5 in) females lay their thick shelled eggs containing first stage larvae. The larvae all possess a cephalic hook and rows of tiny spines around a blunt anterior end, so when they hatch they may further infest their hosts.
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