There is no general contact, besides, you are still wearing shoes, which are not so powerful, and even shoes can penetrate.

Parasitic nematodes often have a very complex life cycle, constantly migrating between different hosts or different parts of the host. Infection routes include eating undercooked meat containing eggs or larvae, entering through unprotected wounds, directly penetrating into the skin, and passing through blood-sucking animals.

The common parasitic nematodes in humans are whipworm, hookworm, pinworm, roundworm and filariasis. Trichinella spiralis can infect mice, pigs and humans, causing trichinosis.

Ascaris usually infects wild animals, but it is also fatal to humans.

Haemophilus contortus/Haemophilus contortus is the most common parasite in sheep all over the world, which has caused huge economic losses to sheep pasture.