When they thought us about it in school they said that the most common problem of a severe infection is that it can cause anemia, because the adult worms feed o

When they thought us about it in school they said that the most common problem of a severe infection is that it can cause anemia, because the adult worms feed on blood in the intestines. It can be prevented by using shoes and not walking barefoot. There are also other species that infect cats and dogs. In those cases what often happens when the larva encounters a human is that it can enter the skin but it can't travel further, so it only does that first part with the itching and drawing red "lines" under the skin.