Personal hygiene is most important for the control of pinworms. Tapeworms can be contracted from eating insufficiently cooked meats, especially beef, pork and fish. The most common tapeworm in the United States is the beef tapeworm, which can grow to a length of 15 to 20 feet in the intestines. Hookworms are often found in the soil or sand in moderate climates. They can enter the body by boring holes in the skin of the bare feet, or can enter by mouth if food contaminated by dirty hands is eaten.
Roundworms are most common in children.
These worms can leave the intestines and settle in different areas of the body, causing diseases such as pneumonia, jaundice or seizures. You can too. When a person is afflicted with worms, the body's supply of all nutrients is depleted to the point that supplementation of all nutrients is necessary to restore normal health. When these same parasites have been repeatedly implanted in healthy animals however, infestations have not occurred as long as the diet has been adequate. Both parasites and worms infest animals deficient in Vitamin A, whereas well-fed controls remain free of infestation.