Russian marathoner Lyubov Denisova, who won the Honolulu Marathon in December and finished seventh in Boston last month, tested positive for an elevated testerone-to-epitestosterone, the AP news agency reports.

“The Russian federation called to let us know she tested positive,” Denisova’s agent, Andrey Baranov, told The Associated Press on Wednesday by telephone. He added that the backup sample also tested positive.

Denisova, who moved to Florida (U.S.) from Moscow in January, apparently made a mistake while buying vitamins on the Internet with her new computer early this year, according to Baranov. Along with the vitamins, the 35-year-old runner also bought Orasten-E, which is banned by the World Anti-Doping Agency.

“Denisova has very limited English,” Baranov said. “She was only looking for the best price (for complex vitamins).

“She told me she started taking (the banned drug) in February. I can’t say how many weeks she was taking it,” Baranov added. “It was a huge surprise.”

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