Gueorgiou was a member of the French relay team at WOC 2008 in Olomouc, Czech Republic. While running in a clear lead on the third leg, he suffered a bee sting on the back of his tongue. He left the course to go directly to the finish, where he collapsed, barely able to breathe. He was transported by helicopter to a hospital.
At WOC 2009 in Miskolc, Hungary, during the last leg of the relay race Gueorgiou, Anders Nordberg (Norway), and Michal Smola (Czech Republic) were close behind the lead runner, Martin Johansson (Sweden), when Johansson suffered a 12 cm deep penetrating trauma from a stick in his right thigh. While Nordberg ran for help, Gueorgiou and Smola stayed with Johansson. Gueorgiou pulled out the stick, then applied compression to the wound using his own shirt and GPS tracking harness. Gueorgiou and Smola then carried Johansson to a road. Nordberg brought a physician there.