1.   In piglets under four months old, larval activity during he pulmonary phase of migration may cause a clinically evident pneumonia which is usually transient an rapidly resolving.

2.   In mild to moderate infections, there are no clinical signs during the pulmonary phase of larval migration.

3.   Most fatalities from T. canis infection occur during the pulmonary phase, and pups which have been heavily infected transplacentally may die within a few days of birth.