xi. ae (f) Bacillary dysentery (gz) Poliomyelitis (7?) (h) Pneumonia Management of Carriers (a) Administration by health authorities (b) Medical ani Surgical Treatment References: Storey--Defensive Hygiene, Chapters 18, 19, 20. Rosenau-—Preventive Medicine, See articles on Malaria, Yellow Fever, Dysentery, Sleeping Sickness, Syphilis, Trichinosis, Tapeworms and Hook Worms. Also on Carriers. : Bossard-—Problens of Social Well-Being, Chapters 10-15. McLaughlin--Communicable Diseases. . DISCUSSION QUESTIONS: 1. How do protozoa and metozoa differ from bacteria? 2. Are they relatively more or less important to man as causes of ill-health? 3. Whet are the essential points in the life cycles of.the malarial parasite? 4, Why is amebic dysentery of special importance to inhabitants of the Pacific Coast? 5. Discuss our mowledge of the presence of syphilis. 6. Which is the most common method of transmission of syphilis? 7. Should an infection with syphilis be a permanent bar to marriage? 8, Name the most important disease producing metozoa. 9. Discuss the defensive hygiene of metozoa. 10. Discuss the management of healthy disease carriers. ‘WEGHANICAL CAUSES OF ILL HEALTH AND DEATH The importence of a defensive hygiene program against mechanical causes of ill health and death is evident when it is noted that approxi- mately 6% to 8% of the deaths recorded in the Registration Area annually are caused by accidents of various kinds. While we have no universal compulsory registration of accidents, the increasing number of states that require industrial and automobile acci- dents to be reported is furnishing 1 rapidly increasing basis for more accurate statistical study. A considerable number of organizations and government agencies are engaged in accumulating evidence of the muses of the various mechanical injuries. Among these my be metioned: