 Information obtained from case studies shows that the pain develops into a long-lasting hyperalgesia that can persist for months but usually lasts from a few days to a few weeks.A clinical report from 1992 showed that the severe pain was persistent and did not respond to morphine.In 1991, Keith Payne, a former member of the Australian Army and recipient of the Victoria Cross (Australia's highest award for valour), was struck on the hand by a platypus spur while trying to rescue the stranded animal.