China's star judoka Tong Wen, who claimed the Beijing Olympics women's 78kg title and three world championships gold medals in a row, has been banned for two years for doping.
The World Anti-Doping Agency said on Wednesday that Jamaican officials need to respond soon to accusations from a former insider who alleges drug-testing procedures are lax.
Stringent measures will be in place to control doping at the 12th National Games, ananti-doping official said.
China's anti-doping authorities Wednesday said eight athletes tested positive in the second quarter of the year, including one through the biological passport.
The World Anti-Doping Agency is warning all athletes at the Asian Youth Games to 'Say No To Doping' in a themed activity that began Friday, the Games' opening day of competition.
Athletics will return to four-year bans for first-time dopers in 2015, putting an end to the practice of Olympic athletes suspended for doping being allowed to compete in the following Games.
There will be over 800 doping tests conducted at the world swimming championships.
More than 800 doping tests will be conducted during the swimming world championships slated for July 19 to August 4 in Barcelona.
Adidas AG has suspended its contract with Tyson Gay Monday after the former double world sprint champion failed an out-of-competition doping test.
Olympic discus thrower Allison Randall on Monday became the third athlete to confirm a positive drugs test from the Jamaican trials in June following Sunday's revelations by sprinters Asafa Powell and Sherone Simpson.
US star pulls out of the worlds in Moscow; Powell also positive
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