On February 21, 2007, Sergey Shiryayev of Russia was involved in pre-competition testing for doping with a blood and urine sample. The blood sample in the "A-test" turned out high in hemoglobin, so the "B-test" was evaluated and confirmed to contain EPO. Shiryayev, who had his best finish of 11th in the 15 km event at the championships, was subsequently disqualified on March 4, 2007.
On February 21, 2007, Sergey Shiryayev of Russia underwent pre-competition doping tests involving a blood and urine sample. The "A-test" showed elevated hemoglobin levels, leading to the evaluation of the "B-test," which detected EPO. Despite finishing 11th in the 15 km event at the championships, Shiryayev was disqualified on March 4, 2007.