England take bronze as India clinch historic relay gold
England's women's 4x400m Commonwealth Games relay squad have been promoted to silver after Nigeria's Folashade Abugan failed a drugs test in Delhi.
Abugan, who was a part of the Nigerian quartet, has also been stripped of the silver medal she won in the 400m.
Her team-mates Damola Osayemi, who had won the women's 100m, and 110m hurdler Samuel Okon previously failed tests.
Abugan, who tested positive for testosterone prohormone, waived the right to have her B sample analysed.
India won the 4x400m relay race with English quartet Kelly Massey, Victoria Barr, Meghan Beesley and Nadine Okyere finishing third. Canada, who were fourth, are promoted to the bronze medal.
In the 400m, which was won by Botswana's Amantle Montsho, Guyana's Aliann Tabitha Pompey and Christine Amertil of the Bahamas are promoted to silver and bronze respectively.
The Games' Federation said in a statement: "Ms Abugan had committed an anti-doping rule violation.
"Consequently, she has been disqualified from all events she participated in during the Games, with the results nullified.
"This includes her silver medal in the women's 400m. As she was also a member of her country's second placed 4x400m relay team, that result is also nullified."
The BBC's Matthew Kenyon in Delhi says this is a big blow for Nigeria's record, as the team has had its best Commonwealth performance in years, coming ninth in the medals table.
"Part of the problem facing Nigerian sport is that the country still does not have a domestic anti-doping agency," he reports.
The other issue is educating athletes, as often they simply do not realise they are taking banned substances, our reporter says.
Both Osayemi and Okon tested positive for methylhexaneamine, which was only banned by the World Anti-Doping Agency as a stimulant last year.
Earlier this year, it was reclassified and from the start of 2011 it can be used with a therapeutic use exception certificate.
The drug, which has some performance-enhancing qualities, is commonly found but often not labelled in supplements and products such as nasal decongestants.