the spread of infectious microorganisms through the air, usually over distances greater than one metre from the infected host.

Occurs when airborne particles remain suspended in the air, travel on air currents and are then inhaled by others who are nearby or who may be some distance away from the source patient, in a different room or ward (depending on air currents) or in the same room that a patient has left, if there have been insufficient air exchanges. Microorganisms [..]