Helminthic Diseases of the Digestive System Trichinella 1.0% Percentage of world population infected Flukes(liver,lung) 1.5% Tapeworms 3.0% Schistosomes 6.0% Enterobius 10% Hookworms 21% Ascaris 30% 3 5678910 11 Number of people infected(100 millions) Figure 25.21Helminthic Diseases of the Digestive System Figure 25.21