Health defined: Health is a state of minimum impairment,
which to achieve requires a maximum of competence (physical,
physiological, intellectual, social), as well as the necessary
resources, opportunities and motivation (V. Geist, 1989).
Good Health: The slowest possible rate of death.
Disease defined: A lack of health.
A disturbance to the normal
function or structure of an animal (Bolen and Robinson, 1999).
Causative agents of disease: usually infectious, parasitic,
toxic, physiological, nutritional, congenital, and
Etiology: the science dealing with causes of disease
(etiological agent refers to the cause(s) of a disease.)
Pathogens: etiological agents that include bacteria,
viruses, rickettsias, parasites, fungi and others
Epizootic: The acute outbreak or expression of disease,
e.g. large numbers of animals infected (generally same
Enzootic: The low but chronic level of a disease
occurrence in a single population.
Zoonosis: Refers to diseases that may be shared by man
and animals, huge number, -- e.g. rabies, tularemia,
influenza, undulant fever (brucellosis), plague
(bubonic/pneumonic), hantavirus (HPS), mad cow
disease and etc.