Highway Patrol troopers say Adelaide Virnig, 17, was riding her bike on Route JJ about 5 miles north of Sparta Sunday evening when the accident happened.
The motorcycle, driven by a man from Ozark, was trying to pass Virnig, when she turned the bike into the motorcycle's path.
The motorcycle driver had minor injuries, according to Highway Patrol online reports.
Virnig was taken to a Springfield hospital with serious injuries.
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