STUDIES ON THE LIFE HISTORY OF TRICHOCEPHALUS VULPIS, THE WHIPWORM OF DOGS

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Abstract
Under experimental conditions fully embryonated eggs of Trichocephalus vulpis hatch in the small intestine of dogs within 30 min. after the eggs are fed. The larvae penetrate the intestinal mucosa within 24 hr. after infection and at that time may be found deeply embedded. Between 48 and 96 hr. after infection the larvae become coiled and sluggish, and the majority are found lying at the base of the crypts of Lieberkühn in the upper levels of the small intestine. They do not work their way back to the lumen of the intestine for at least eight days, although there is some evidence that they may return to the lumen by the 10th day after infection and are then carried passively down to the large intestine. There is some minor tissue destruction by the larvae during their mucosal penetration.

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