(VOVworld)-A haemorrhagic fever of unknown origin has killed 13 people in the northwestern Democratic Republic of Congo since August 11, a health ministry official said. All 13 people who have died suffered from fever, diarrhoea, vomiting and, in the terminal stage, of vomiting black matter. So far, about 80 people who came into contact with the deceased have been admitted to hospital.

In another development relating to Ebola, more countries have closed their borders with other West African countries, where many people have been affected by the virus. Senegal's decision to close its land border with Guinea, announced by the interior ministry yesterday, is part of intensifying efforts to contain the outbreak which killed 1,350 people since March in Guinea, Liberia, Nigeria and Sierra Leone.

South Africa has reached an agreement to spend about 3 million USD for the prevention of the spread of Ebola to South Africa and other countries.