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Jemima Sumgong, who last year became the first Kenyan woman to win Olympic gold in the marathon, has tested positive for the banned blood-booster EPO in an out-of-competition test carried out by the IAAF, the sport's governing body has confirmed.
"The IAAF can confirm that an anti-doping rule violation case concerning Jemima Sumgong (Kenya) has commenced this week," the International Association of Athletics Federations said in a statement.
"The athlete tested positive for EPO (Erythropoietin) following a no-notice test conducted by the IAAF in Kenya.
"This was part of an enhanced IAAF out-of-competition testing programme dedicated to elite marathon runners."
If Sumgong's B sample is confirmed as positive and she is subsequently banned it will be a massive blow for African distance powerhouse Kenya.
The African nation greeted her Rio victory with near-delirium after a long and inexplicable barren spell over the classic distance at the Olympics.
Kenya took silver in the women's marathon at the three previous Games and a bronze in 2000, having previously failed to medal following the introduction of the women's race to the Games in 1984.
Sumgong, 32, had a stellar 2016, winning the London Marathon in April then claiming the elusive Olympic gold in Rio despite being disturbed by a protester on the course.
- Finished fourth in Boston Marathon in 2014, then second in New York City Marathon
- Won the London Marathon in April, despite falling during the race
- Clinched gold in Rio to break Kenya's long Olympic marathon drought
Sumgong's former compatriot Eunice Jepkirui, who switched allegiance to Bahrain in 2013, took silver.
Eliud Kipchoge won the men's race to complete a Kenyan double.
Thursday's news comes in the wake of a four-year ban handed to Kenya's multi-marathon champion Rita Jeptoo, Sumgong's former training partner, after she tested positive for EPO in 2014.
Kenya's middle and long distance success has been marred by doping cases involving elite athletes. Officials estimate the number of positive tests at about 50 in the past four years.
The latest cases will be seen by observers as evidence of how the IAAF is making progress in the region after previous official criticism of anti-doping regimes in Kenya and Ethiopia.
Both countries have in the past been deemed non-compliant with the World Anti-Doping Agency's (WADA) code.
Reuters
Topics: olympics-summer, marathon, sport, doping-in-sports, kenya