India's Neelam Jawant Singh and Vladyslav Piskunov of Ukraine provided the only positive tests at the world athletics championships in Helsinki, the International Association of Athletics Federations (IAAF) said on Monday.
Women's discus thrower Singh failed a test for the banned stimulant pemoline during the championships and hammer thrower Piskunov's positive for the anabolic steroid drostalone was confirmed after competition had ended.
Singh did not qualify for the discus final and Piskunov was last in the hammer final.
The largest ever anti-doping programme at an athletics event was implemented at the championships which ran from August 6 to 14, the IAAF said on its Web site.
In total, 884 tests were carried out before and during the championships on 708 athletes.
Blood and urine samples were taken to test for, among other things, EPO (erythropoietin) and the detection of blood transfusions.