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21.1 Distinguishing Disease from Injury
Delegates should make an early provisional classification of the condition claimed, i.e. as a disease or injury. This should occur as early in the investigation as possible because the criteria for liability are different for injury and disease.
In brief, however, a disease is an ailment, generally of gradual onset and is generally caused by factors other than a single trauma i.e. a blow or a fall. Attrition of the joints, infectious illnesses and mental disorders are all 'diseases'. PTSD, whilst deemed a disease, is an exception in that its onset is caused by a single traumatic event. However the date of effect will still be determined as for any other disease and not the date the trauma occurred.