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| ====Definition and Type==== | | ====Definition and Type==== |
− | A definite morbid (illness producing) process having a characteristic train of symptoms or
| + | |
− | signs: it may affect the whole body or any of its parts and its aetiology, pathology and
| + | * '''Disease''' is a definite morbid (illness producing) process, having a characteristic train of symptoms or signs. |
− | prognosis may be known or unknown. | + | ** May affect the whole body or any of its parts. |
− | Disease can be divided into two main categories
| + | ** The disease's aetiology, pathology and prognosis may be known or unknown. |
− | 1. Acute - of sudden onset and short duration
| + | * There are two main categories of disease. |
− | Outcome - a. causes death of the animal, or
| + | *# '''Acute''' |
− | - b. resolves due to host defence response or clinical therapy, or
| + | *#* Characterised by sudden onset and short duration. |
− | - c. becomes chronic disease
| + | *#* The outcome of acute disease may be: |
− | 2. Chronic - of insidious onset and protracted course
| + | *#** Death |
− | Outcome - a. progressively destroys tissue compromising its function and endangering life,
| + | *#** Resolution due to host defence response or clinical therapy |
− | or
| + | *#** Progression to chronic disease |
− | - b. its course is halted and the tissue repairs by scarring
| + | *# '''Chronic''' |
| + | *#* Characterised by insidious onset and protracted course. |
| + | *#* The outcome of chronic disease may be: |
| + | *#** Progressive destruction of tissue |
| + | *#*** Compromises funtion and endangers life, |
| + | *#** The halting of the course of disease, with tissue repair by scarring. |
| + | |
| ====Factors Involved in the Development of Disease==== | | ====Factors Involved in the Development of Disease==== |
| ====Types of Agents Causing Disease==== | | ====Types of Agents Causing Disease==== |