Abstract

One third of the human species is infested with worms. The World Health Organization estimates that worms account for 40 per cent of the global disease burden from tropical diseases excluding malaria. Worms cause a lot of misery.In this article I will focus on one particular type of infestation, which is hookworm. Approximately 740 million people suffer from hookworm infection in areas of rural poverty: more than one human in ten, a total greater than twenty-three times the population of Canada or twice the population of the United States. The greatest numbers of cases occur in China, Southeast Asia, and Sub-Saharan Africa- that is, mostly in the places in the world where poverty is most severe.Hookworm larvae pierce the skin, enter the bloodstream, work their way into the heart and then into the lungs, where they climb the bronchial tree into the throat and are swallowed.