LAUSANNE, Switzerland (AP) — Usain Bolt has lost one of his nine Olympic gold medals in a doping case involving teammate Nesta Carter.

The IOC says Carter tested positive for a banned stimulant, in re-analysis of samples from the 2008 Beijing Olympics.

Carter and Bolt were teammates on the winning 4x100-meter relay team, which also included Michael Frater and Asafa Powell.

The relay title in Beijing completed the first of Bolt's three gold medal sweeps in the 100, 200 and relay at three straight Olympics.