John Smit's South Africa triumphed with victory over England in Paris

During the seven-week tournament 212 tests were carried out but no evidence has emerged of any wrongdoing.

Four urine samples were taken at each of the 48 matches, while 20 blood tests were taken away from competition.

IRB anti-doping manager Tim Ricketts said: "The anti-doping program, which was the largest of its kind for a rugby tournament, proved a massive success."

606: DEBATE Your thoughts on the absence of a single positive drugs test at the Rugby World Cup

Rickets revealed that the IRB has retained all blood samples until a test for human growth hormone is approved.

"These samples are currently being stored at the World Anti-Doping Agency accredited laboratory in Paris until such a test is available," he said. "WADA predicts that this could be as soon as within the next 12 months."

The French National Anti-Doping Agency helped drug testing in the matches in France, with UK Sport taking responsibility for matches held in Edinburgh, Scotland, and Cardiff, Wales.

The IRB said it was on target to conduct more than 1,300 doping tests during 2007, which would be a record for the organisation.