There are a vast number of worms that can live within the human body. The worms live in the digestive tract, especially in the intestines, from where they obtain their nutrition. Worm infestations are present in people of all ages but they are much more of a problem in children. Pinworm, hookworm and whipworm are the three major types of roundworms. As they are parasites, they can be found anywhere, in the soil, in bodies of animals as well as humans. Roundworm infection is most common in hot or tropical climates.Parasites can get into the intestine by going through the mouth from uncooked or...