Athens - Puerto Rican wrestler Mabel Fonseca and Hungarian weightlifting silver medallist Ferenc Gyurkovics have been thrown out of the Olympics after failing drugs test, officials said.

Fonseca, 32, tested positive for banned steroid stanozolol after competing in the women's freestyle wrestling 55kg competition where she finished fifth, the International Olympic Committee (IOC) said in a statement.

Gyurkovics meanwhile was stripped of his medal from the 105kg weightlifting competition after traces of the anabolic steroid oxandrolone were found in his system after a test on August 24.

A total of 19 named athletes have been kicked out of the Olympics since the IOC began its testing period on July 30.

A further four more have been banned for either failing to undergo tests or attempting to manipulate test results.

Timeline of doping cases during the Olympic games

AFP Sport lists the cases since July 30 when Olympic drug testing began. The Olympic in-competition period runs from then until the Closing Ceremony on August 29:

Aug 9 - Two baseball players from Greece's Olympic team test positive for drugs. The two were named as Andrew James Brack and Derek Nicholson, both US citizens of Greek descent.

Brack tested positive for the steroid stanozolol and Nicholson for the diuretic hydrochloro-thiazide.

Aug 11 - Kenyan boxer David Munyasi out of Olympics after testing positive for cathine, a stimulant closely related to ephedrine, hours after arriving in the Greek capital.

Aug 12 - The Greek Olympic Committee confirmed that Olympic 200m champion Kostadinos Kenteris and Ekaterini Thanou, the silver medallist in the 100m at the Sydney Olympics, missed scheduled drug tests.

Aug 12 - Spanish cyclist Janet Puiggros Miranda was kicked off her Olympic Games team after testing positive for erythropoietin (EPO). The competitor failed the test on July 17 at the national mountain bike championships in Candanchu in northern Spain.

Aug 13 - Irish distance runner Cathal Lombard given a two year ban for testing positive for the banned blood booster EPO (erythropoietin). The 28-year-old solicitor had been due to compete in the 5,000 metres and 10,000m in Athens.

Aug 16 - Myanmar women's weightlifter Nan Aye Khine thrown out of the Olympics after failing a drugs test. The 27-year-old Nan Aye Khine, who finished fourth in the women's 48kg division, was found to have taken an anabolic steroid.

Aug 18 - Kenteris and Thanou withdraw from the Athens Games rather than risk being found guilty by the IOC over missing a mandatory drugs test last week.

Aug 19 - Six weightlifters are kicked out for failing drug tests. They are named as India's Sanamacha Chanu, Viktor Chislean of Moldova, Zoltan Kecskes of Hungary, Sule Sahbaz of Turkey, Pratima Kumari Na of India and Morocco's Wafa Ammouri.

Aug 20 - Uzbekistan's Olga Shchukina, who finished last in the women's shot put, tested positive for Clenbuterol, a banned anabolic agent, after undergoing a test on August 14.

Aug 21 - Superheavyweight Russian weightlifter Albina Khomich kicked out of the Olympics for failing a drugs test. Khomich, the 2001 world champion and runner-up last year, was among the favourites for the gold medal in the over 75kg category. According to media reports in Russia, she had taken a steroid.

Aug 22 - Greece's Leonidas Sampanis, third in the 62kg competition, was stripped of his bronze medal and thrown out of the Olympics after testing positive for testosterone.

Aug 22 - Russian woman shot-putter Irina Korzhanenko, who won Olympic gold failed a drugs test. She had previously been found guilty of doping and was stripped of the 1999 World Indoor title for her offence.

Aug 23 - Korzhanenko stripped of her gold medal and thrown out of the Games after failing a doping test.

Aug 24 - Hungary's Olympic discus champion Robert Fazekas to be stripped of his gold medal after being caught trying to switch his urine sample during a mandatory drugs test after his victory, an International Olympic Committee source confirmed to AFP.

Aug 26 - Hungarian weightlifter Zoltan Kovacs was banished from the Olympics for refusing to provide a drugs test sample after competing in the under 105kg category. He was the 10th lifter to have been sanctioned for drugs-related offences at the Olympics.

Aug 26 - Ukraine's bronze-medal winning rower Olena Olefirenko tested positive for stimulants after winning finishing third in the woman's quadruple sculls event. Olefirenko and the Ukraine team were stripped of the bronze medal.

Aug 27 - Russian 400-metre runner Anton Galkin kicked out of the Games after testing positive for an anabolic steroid after finishing fourth in the semi-finals. He failed to qualify for the final.

Galkin became the 21st competitor to be sanctioned for drug related offences during the Athens Olympics.

Aug 28 - Puerto Rican wrestler Mabel Fonseca and Hungarian weightlifting silver medallist Ferenc Gyurkovics thrown out of the Olympics after failing drug tests.

Fonseca tested positive for banned steroid stanozolol after competing in the women's freestyle wrestling 55kg competition where she finished fifth.

Gyurkovics was stripped of his medal from the 105kg weightlifting competition after traces of the anabolic steroid oxandrolone were found in his system after a test on August 24. - Sapa-AFP