When infection and colonization results in a
change in the state of health, disease occurs.
In epidemiological terms, a broad term for disease is morbidity.
Mortality is death due to disease or injury.
Infectious disease is
caused by the activity of invading microorganisms that can be spread from
one host to another.
Disease can also occur due to damage the body inflicts
upon itself as a result of the attempt to combat infecting agents.