Question

Necessary and Sufficient Causes of Disease

Answer 1

Disease: Disease can be defined as a condition in which the body health is impaired a departure from a state of health, an alteration of the human body inturrupting the performance of vital functions.

Concept of causation:The germ theory is the revolutionary concept of all epidemiologist to reveal about disease causation

disease agent---------> man------------->disease

Epidemiological triad:The germ theory has many limitations.so next theory came into existence to break the limitation of germ theory.that is epidemiological triad.agent,host and environment.

There may be number of sufficient causes for a given disease,there must be a sufficient necessary cause to get a outcome.for example.HIVinfection must be a sufficient necessary cause for AIDS ,which is the outcome of HIV infection

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