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Brazilian swimmer Cesar Cielo gives the thumb-up sign following a training session at the FINA 2011 Swimming World Championships in Shanghai, China, Thursday, July 21, 2011. Wong Maye-E, Associated Press
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Brazilian swimmer Cesar Cielo walks to the venue of a specially assembled Court of Arbitration for Sport panel Wednesday July 20, 2011 in Shanghai, China. A hearing into world and Olympic champion Cielo's doping case was held Wednesday before the speciall The Associated Press
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Brazilian swimmer Cesar Cielo looks back following a training session at the FINA 2011 Swimming World Championships in Shanghai, China, Thursday, July 21, 2011. Wong Maye-E, Associated Press
By Associated Press

SHANGHAI — Olympic and world champion Cesar Cielo has been cleared to compete in the world championships after the Court of Arbitration for Sport upheld a decision by the Brazilian swimming federation.

CAS made the announcement Thursday. The decision was first reported by The Associated Press.

Swimming governing body FINA challenged a Brazilian federation decision to give Cielo only a warning after he tested positive for furosemide, a banned diuretic and masking agent, at a meet in Rio de Janeiro in May.

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Cielo said he consumed the drug in a contaminated batch of a food supplement he regularly used.

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