Australian cyclist Michael Rogers says he never knowingly took the banned substance clenbuterol and his positive doping test may have resulted from contaminated food in China.
Russian rider Nikita Novikov was provisionally suspended on Friday by the International Cycling Union after testing positive for doping.
Russian track cyclist Valery Kaykov has been suspended after testing positive for a black-market drug that the World Anti-Doping Agency issued a health warning about last month.
Cyclist Frank Schleck was suspended for a year Wednesday and will miss the Tour de France for using a banned substance on last year's Tour.
Alberto Contador, a two-time winner of the Tour de France who was stripped of a third title for using a banned substance, says cycling needs to take something positive from the Lance Armstrong scandal.
Luxembourg rider Frank Schleck denied taking any banned substance despite testing positive for a forbidden diuretic at the Tour de France, and has suggested he may have been poisoned.
American cyclist Lisban Quintero has been suspended for two years after testing positive for a banned substance.
Cycling's governing body says Spanish Vuelta runner-up Ezequiel Mosquera and another rider tested positive for a banned substance during this year's race.
Tour de France winner Alberto Contador held a news conference Thursday to address reports of a positive drug test.
Belgian rider Roy Sentjens says he resorted to doping with EPO earlier this year and is now retiring from cycling after testing positive for the banned substance.
New Zealand track cyclist Adam Stewart has been banned for two years for attempting to use a banned substance.
Italian cyclist Danilo Di Luca denied he took a banned substance as he faced questions Wednesday from the Italian Olympic Committee's anti-doping prosecutor.
France's anti-doping authority banned German cyclist Stefan Schumacher from French races for two years after he tested positive for a banned substance at the 2008 Tour de France.
Italian cyclist Leonardo Piepoli has been banned for two years Monday after testing positive for a banned substance at last year's Tour de France.
The U.S. Anti-Doping Agency suspended cyclist Ricardo Hernandez after he tested positive for a banned substance.
German cyclist Stefan Schumacher tested positive for a banned substance during the Tour de France, his team said Monday.