1.1 What Is Disease?

According to the WHO, a disease is any harmful deviation from an organism’s normal structural or functional state, generally associated with certain signs and symptoms and differing in nature from physical injury.”

A disease is referred to as a disorder of structure or function. It harms the organism it occurs within and has specific signs or symptoms.

Diseases can broadly be classified into communicable (infectious) and non-communicable (noninfectious) diseases. Influenza, common cold, typhoid, and pneumonia are all diseases.

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