A Thayer Teen was seriously injured in a one vehicle accident last night east of Koshkonong. The Highway patrol reports that 17 year old Dalton Perkins of Koshkonong failed to negotiate a curve and hit a tree. A passenger in the vehicle, 17 year old Diamond Bledsoe suffered serious injuries and was flown to Cox South in Springfield. Perkins suffered minor injuries and was taken to Ozarks Medical Center in West Plains. The accident happened on RT Z at County road 323 about 5 miles east of Koshkonong.