World Health Organization (WHO) Officials in Angola fear that the outbreak of the deadly Marburg virus will get worse. The World Health Organisation says the cycle of the disease has not been broken, and it is not yet controlled. A joint statement from Angola's health ministry and the World Health Organisation (WHO) said an additional 513 people are under quarantine and surveillance with no new cases reported in other areas. We don't think that it is over," David Daigle of the WHO said.."The numbers are still going up." The Angolan health ministry feels the outbreak of Marburg Virus remains contained to the town of Uige in the country's northern district, helped by poor roads and isolation of the area. While people outside the town have contracted the disease, the Government says all had visited Uige, which is the epicentre of the outbreak. The virus has killed 235, said to be more deadly than Ebola. Most of the victims have been children. The Marburg vuris can kill a healthy person in a week, inducing bloody vomiting and diarrhoea, followed by severe fever. The disease is spread through contact with bodily fluids, such as sweat, saliva and blood. The disease is not treatable with any known drugs and an innoculation is not available.