Camenzind has been fired by Phonak
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Cyclist Oscar Camenzind has retired from the sport after failing a drugs test in the build-up to the Olympics.
The 1998 world champion tested positive on 22 July for the banned endurance drug erythropoietin (EPO).
Under Swiss cycling federation rules, a rider is automatically suspended if a first test shows up positive.
The positive test saw him excluded from Switzerland's Olympic team, his country have yet to name a replacement - and he was also fired from his Phonak team.
Zurich-based Phonak said in a statement that Camenzind accepted full responsibility for the incident.
"Every rider who, during racing or training, is tested positive for a performance-enhancing substance, or carries such a substance with him, must count on being dismissed immediately," said Phonak team manager Urs Freuler.