The document discusses diseases, their causes and types. It defines disease as an abnormal condition that impairs the body's normal functioning and can cause discomfort, dysfunction, distress and death. It categorizes diseases as communicable/contagious which can pass from person to person, and non-communicable which result from genetics or lifestyle. It also discusses the chain of infection and lists common communicable diseases like cold, influenza, pneumonia, chickenpox and measles.

1. DISEASES: What it is and what it's not.

7. Conditions Contributing to Disease

8. Economy Culture Environment Politics Education

14. COMMUNICABLE DISEASES

17. Types of Pathogens: BACTERIA RICKETTSIAE PROTOZOA PARASITICWORMS FUNGI VIRUS

24. Chain of infection: Causative Agent Reservoir Portal of exit Mode of transmission Portal of entry Susceptible host