People have illness and physicians diagnose and treat disease. The disease is an objective term which implies malfunctioning of the body or part of the body.,furthermore, any harmful deviation from the normal structural or functional state of an organism, generally associated with certain signs and symptoms and differing in nature from physical injury.

 Some infections are spread when an infected person talks, breathes, coughs or sneezes tiny particles containing infectious agents into the air. These are called small particle aerosols. Due to their tiny size, small particle aerosols can travel long distances on air currents and remain suspended in the air for minutes to hours. These small particle aerosols may be breathed in by another person.

Examples of airborne spread diseases: 
  • chickenpox
  • measles
  • tuberculosis (TB)
  • coronavirus