A Liberian doctor who was administered an experimental Ebola drug has died.

The information minister of the country today said that the death of the doctor comes at a time when a top U.N. delegation promised more help for countries battling the deadly viral disease.

Dr. Abraham Borbor, the deputy chief medical doctor at Liberia's largest hospital, was given the untested drug, ZMapp. Two other Americans were also given the drug manufactured by a US-based firm.
The two Americans received treatment in the US after being flown to Atlanta from Liberia and they have survived.

A Spanish missionary priest infected with Ebola also received the treatment but he also failed to survive. Not much information is available about the conditions of e two other Liberians who were also given doses of ZMapp.

Borbor "was showing signs of improvement but yesterday he took a turn for the worse," and died Sunday, Information Minister Lewis Brown said.

The latest Ebola outbreak has killed over 1,400 people across West Africa in the countries of Liberia, Guinea, Sierra Leone and Nigeria. A separate Ebola outbreak was reported over the weekend in Congo but experts say it is not related to the West African epidemic.

In Sierra Leone, the World Health Organization today announced that it is replacing its country representative. Dr. David Nabarro, who is coordinating the UN's response to the Ebola crisis, today said that more international help is required to tackle the outbreak.

"The effort to defeat the Ebola disease is not a battle but a war that requires everybody to work together and effectively, and it is not easy to make a judgment as to whether we are winning the war or losing it," he told journalists at a news conference in the capital.