1. Concept of disease  DR.HARIVANSH CHOPRA PROFESSOR COMMUNITY MEDICINE LLRM MEDICAL COLLEGE,MEERUT harichop@gmail.com 5/2/2015 1 DR.HARIVANSH CHOPRA

2. 5/2/2015DR.HARIVANSH CHOPRA 2 OBJECTIVE LEARN DEFINITION OF DISEASE CAUSES OF DISEASE NATURAL HISTROY OF DISEASE

3. Webster defines disease as "a condition in which body health is impaired, a departure from a state of health, an alteration of the human body interrupting the performance of vital functions". 5/2/2015 3 DR.HARIVANSH CHOPRA

4. The Oxford English Dictionary defines disease as "a condition of the body or some part or organ of the body in which its functions are disrupted or deranged" 5/2/2015 4 DR.HARIVANSH CHOPRA

5. From an ecological point of view, disease is defined as a maladjustment of the human organism to the environment" 5/2/2015 5 DR.HARIVANSH CHOPRA

6. DISEASE disease" literally means "without ease" (uneasiness) ­disease, the opposite of ease – when something is wrong with bodily function 5/2/2015 6 DR.HARIVANSH CHOPRA

7. Illness" refers not only to the presence of a specific disease, but also to the individual's perceptions and behaviour in response to the disease, as well as the impact of that disease on the psychosocial environment 5/2/2015 7 DR.HARIVANSH CHOPRA

8. Sickness" refers to a state of social dysfunction. 5/2/2015 8 DR.HARIVANSH CHOPRA

9. Disease is a physiological/psychological dysfunction; Illness is a subjective state of the person who feels aware of not being well; Sickness is a state of social dysfunction, ie., a role that the individual assumes when ill ("sickness role"). 5/2/2015 9 DR.HARIVANSH CHOPRA

10. DISEASE CAUSATION GERM THEORY MULTIFACTORIAL CAUSATION 5/2/2015 10 DR.HARIVANSH CHOPRA

11. CLASSIFICATION OF DISEASE COMMUNICABLE DISEASES NON COMMUNICABLE DISEASES NUTRITIONAL DISORDERS 5/2/2015 11 DR.HARIVANSH CHOPRA

12. CLASSIFICATION OF DISEASE NEOPLASTIC DISEASES METABOLIC DISORDERS DEGENERATIVE DISEASES 5/2/2015 12 DR.HARIVANSH CHOPRA

13. CLASSIFICATION OF DISEASE MENTAL DISEASES ACCIDENTS CONGENITAL DISEASE 5/2/2015 13 DR.HARIVANSH CHOPRA

14. COMMUNICABLE DISEASES VIRAL FUNGAL PARASITIC BACTERIAL 5/2/2015 14 DR.HARIVANSH CHOPRA

15. AGENTS Biological agents: Nutrient agents Physical agents Chemical agents Mechanical agents Absence or insufficiency or excess of a factor necessary to health Social agents 5/2/2015 15 DR.HARIVANSH CHOPRA

16. HOST FACTORS 5/2/2015 16 DR.HARIVANSH CHOPRA DEMOGRAPHIC GENETIC SOCIO-ECONOMIC LIFE STYLE

17. 5/2/2015DR.HARIVANSH CHOPRA 17 ENVIRONMENT PHYSICALBIOLOGICAL PSYCHO- SOCIAL

18. Epidemiological triad AGENT HOST ENVIRONMENT DISEASE LOAD 5/2/2015 18 DR.HARIVANSH CHOPRA

19. HOST AGENT INCUBATION PERIOD DISEAS E SEVERE DISEASE SUB CLINICAL DISEASE DEATH RECOVER Y PRE PATOGENIC PHASE PATHOGENIC PHASE DISAB ILITY PRIMARY PREVENTION SECONDRY PREVENTION TERTIARY PREVENTION HEALTH PROMO TION SPECIFI C PROTEC TION EARLY DIAGNOSIS AND TREATMENT DISABILITY LIMITATION REHABILITAT ION NATURAL HISTORY OF DISEASE