It is a prerequisite of diagnosis that the individual is exposed to a specific incident of exposure to threatened or actual death, or serious injury to self or others. Individuals are required to present at least one symptom from each of the four clusters for more than one month and associated impairment on social, occupational and/or other important areas of functioning before a diagnosis can be made. The four major clusters of symptoms of PTDS are:
1. Re-experiencing symptoms: including intrusive memories, flashbacks, nightmares, and distress to