NASCAR driver Brian Vickers was being treated Thursday for an undisclosed medical condition that will prevent him from racing this weekend at Dover International Speedway. Red Bull Racing said Vickers was hospitalized Wednesday night and being held for further testing. The team did not reveal where he was hospitalized, although Vickers was scheduled to visit Walter Reed Army Medical Center in Washington, D.C., on Thursday and tour the Capitol with U.S. Rep. Doc Hastings. Red Bull said Casey Mears will replace Vickers this weekend in the No. 83 Toyota. "It is unfortunate that I will not be able to participate in the Dover race," Vickers said in a statement. "Casey is a good friend of mine, and I know he will do his best for the No. 83 team this weekend." Red Bull general manager Jay Frye called Vickers' illness a "minor setback." http://sports.espn.go.com/rpm/nascar/cup/news/story?id=5186106