Semenya ran the quickest ever 800 metres on US soil at the Prefontaine Classic Diamond League meeting last month [Ezra Shaw/Getty Images/AFP]

Double Olympic champion Caster Semenya will not be able to defend her 800-metres title at the World Championships in September after a Swiss court reversed a ruling that temporarily lifted the IAAF’s testosterone regulations imposed on her, a spokesperson for the athlete said. 

The South African runner is appealing the Court of Arbitration for Sport’s (CAS) ruling that supported regulations introduced by the sport’s governing body, the International Association of Athletics Federations (IAAF).

According to the new rules, XY chromosome athletes with differences in sexual development (DSDs) can race in distances from 400m to a mile only if they take medication

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