A condition which alters or interferes with the normal state of an organism and is usually characterized by the abnormal functioning of one or more of the host’s systems, parts or organs (Churchill’s Medical Dictionary, 1989). A morbid entity characterized usually by at least two of these criteria: recognized aetiologic agents, identifiable groups or signs and symptoms, or consistent anatomical alterations 9stedman’s Medical Dictionary, 1990). Potential insufficient to satisfy the demands of life as outlined by Bircher.