How dangerous is 106 degree fever?

At 103 degrees you should go to the doctor's office; at 104 you should think about going to the hospital; at 105 you are in danger; at 106 or higher you would be sustaining brain damage and will be at significant risk of seizures, coma, paralysis, or death. Death occurs in minutes at that temperature; if you have a temperature of 106 degrees you should be calling 911.