Qa'dah 19, 1431, Oct 27, 2010, SPA -- A cholera outbreak in Nigeria has killed more than 1,500 people, the United Nations said Tuesday. It is the worst cholera outbreak in Nigeria in recent years, CNN reported. The number of cases is three times higher than last year and seven times higher than in 2008, the United Nations Children's Fund said. The outbreak has led to 40,000 cases in Nigeria and resulted in 1,555 deaths, UNICEF said. Women and children account for four of every five cases, the agency said. The disease's spread seems to have been largely contained in Nigeria, where new cases are still being reported in parts of the country, particularly the northeast, the United Nations said.