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 400 metres.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."Source: BBC