Disease
is an alteration of the body or body
organs that interrupts or
disturbs the
body’s
function. Such disturbances often are recognized by
detectable alterations of body functions.
Etiology is the study of disease causes.
A disease often results from a combination of two or more causes:
1. indirect
or predisposing
factors that may lower the
animal’s
resistance
2. direct
or determining factors that produce the actual disease.
What is disease?