Causes The eggs of these parasites are introduced into the human system through the medium of food or water, especially under cooked or badly-cooked meat. Roundworms are caused by eating contaminated foods. If the soil in which children play becomes contaminated with the eggs of these parasites, they are easily transferred to the mouth through dirty fingers, particularly by children living in unhygienic conditions. There is always a greater danger of contamination where human wastes are used in fertilizing vegetables. Great care should therefore be taken to ensure that all foods are thoroughly cleansed and properly cooked before use.
Hookworms enter the human body through skin from infected water.
Pinworms and threadworms transmission result from dirty fingers and food. Tapeworms are transmitted to the body through under-cooked flesh foods. The real cause of intestinal worms, however, is the use of contaminated food or water. The eggs of these worms, can breed in the intestine only if they find a suitable medium for their propagation. This medium is an intestinal tract clogged with morbid matter and systemic refuse due to wrong feeding habits.