The big-gest anti-doping programme in athletics world championship history at Osaka has so far unearthed one "adverse result", IAAF president Lamine Diack said on Sunday.
The athlete concerned would not be identified until next week under the rules of the governing body of world athletics, the Senegalese said.
"I have been informed that we do have one adverse result but we will not be able to confirm the name or nationality of the athlete as we are still in the early stages of the process." .There were two doping violations at the last world championships.
