Changes

===Definition and Type===

===Definition and Type===

'''Disease''' is a definite morbid (illness producing) process, having a characteristic train of symptoms or signs.

'''Disease''' is a morbid (illness producing) process, having a characteristic train of symptoms or signs. It may affect the whole body or any of its parts, and the disease's aetiology, pathology and prognosis may be known or unknown.

* May affect the whole body or any of its parts.

 

* The disease's aetiology, pathology and prognosis may be known or unknown.

There are two main categories of disease:

There are two main categories of disease:

*# '''Acute''' - characterised by sudden onset and short duration.

# '''Acute''' - characterised by sudden onset and short duration.

*#* The outcome of acute disease may be:

#* The outcome of acute disease may be:

*#** Death

#** Death

*#** Resolution due to host defence response or clinical therapy

#** Resolution due to host defence response or clinical therapy

*#** Progression to chronic disease

#** Progression to chronic disease

*# '''Chronic''' - characterised by insidious onset and protracted course.

# '''Chronic''' - characterised by insidious onset and protracted course.

*#* The outcome of chronic disease may be:

#* The outcome of chronic disease may be:

*#** Progressive destruction of tissue

#** Progressive destruction of tissue, which compromises function and  endangers life,

*#*** Compromises function and  endangers life,

#** The halting of the course of disease, with tissue repair by scarring.

*#** 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===