Immune To Diseases

There is at bottom only one genuinely scientific treatment for all diseases, and that is to stimulate the phagocytes - George Bernard Shaw
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Disease
Cell Death
Host and Pathogen
Dis-ease
 
Disease is a state of disorder of any organ of the body, both structurally and functionally. The etymological definition is as follows: dis (lack of, not) and ease (freedom from pain, labor, discomfort) (c.1330, "discomfort," from O.Fr. desaise, from des- "without, away" + aise "ease". Sense of "sickness, illness" first recorded 1393; the word still sometimes was used in its litrary sense early 17th century).
 
Following passages, from well knwon lexicons, that describe about disease; 

1) a disordered or incorrectly functioning organ, part, structure, or system of the body resulting from the effect of genetic or developmental errors, infection, poisons, nutritional deficiency or imbalance, toxicity, or unfavorable environmental factors (Dictionary.com)

 

2) an impairment of the normal state of the living animal or plant body or one of its partsthat interrupts or modifies the performance of the vital functions and is a response to environmental factors (as malnutrition, industrial hazards, or climate), to specific infective agents (as worms,bacteria, or viruses), to inherent defects of the organism (as genetic anomalies), or to combinations of these factors (Websters.com) 

 

 
Cellular Adaptations, cell injury and cell death

The normal cell is confined to a fairly narrow range of function and structure by its genetic programs of metabolism, differentiation, and specialization; by constraints of neighboring cells; and by the availability of metabolic substrates. It is nevertheless able to handle normal physiologic demands, maintaining a steady state called homeostasis. More severe physiologic stresses and some pathologic stimuli may bring about a number of physiologic and morphologic cellular adaptations, during which new but altered steady states are achieved, preserving the viability of the cell and modulating its function as it responds to such stimuli. The adaptive response may consist of an increase in the number of cells, called hyperplasia, or an increase in the sizes of individual cells, called hypertrophy. Conversely, atrophy is an adaptive response in which there is a decrease in the size and function of cells. If the limits of adaptive response to a stimulus are exceeded, or in certain instances when the cell is exposed to an injurious agent or stress, a sequence of events follows that is loosely termed cell injury. Cell injury is reversible up to a certain point, but if the stimulus persists or is severe enough from the beginning, the cell reaches a “point of no return” and suffers irreversible cell injury and ultimately cell death. Adaptation, reversible injury, and cell death can be considered stages of progressive impairment of the cell’s normal function and structure. For instance, in response to increased hemodynamic loads, the heart muscle first becomes enlarged, a form of adaptation. If the blood supply to the myocardium is insufficient to cope with the demand, the muscle becomes reversibly injured and finally undergoes cell (Robbins pathology).