The eggs are then eaten by earthworms in which they develop through three larval stages over 10 days to become infective. The cycle is completed by the pig eating the earthworm. Infection, therefore, only occurs where pigs have access to earthworms, for example, in outdoor production.
After being eaten by earthworms, the eggs develop through three larval stages over ten days before becoming infectious. This process concludes with a pig consuming the earthworm. Therefore, infection is only possible when pigs have access to earthworms, particularly in outdoor environments.