Describe acute stress disorder and distinguish from PTSD

What will be an ideal response?

Acute stress disorder is characterized by the development during or within 1 month after exposure to an extreme traumatic stressor of at least nine symptoms associated with intrusion, negative mood, dissociation, avoidance, and arousal (these are largely the same symptoms as PTSD, described below, but last for 1 month or less). Similar to PTSD, the traumatic event is relived over and over, leading to attempts to avoid any reminders that arouse memories of it. Acute stress disorder emphasizes the more immediate, but short-term, dissociative reactions to trauma, whereas PTSD reflects the longer-lasting, ongoing pattern.