The World Health Organization (WHO) launched a raft of emergency measures in the Guinean capital Conakry Thursday to control an outbreak of the deadly Ebola virus that has so far killed 100 people across the country.

The UN health agency announced emergency training for 70 people who would fan out across the community to track people who have had close contact with Ebola patients.

The agency is also setting up a special alert and response operation center within the Guinean ministry of health in order to handle all matters relating to the Ebola scare.

The WHO also said that it was training staff at Guinea's Donka national teaching hospital and would be expanding that program to other health facilities in the coming days.

The WHO this week described west Africa's first-ever Ebola outbreak among humans as one of the most challenging since the virus emerged in 1976 in what is now the Democratic Republic of Congo.

According to the latest WHO figures, 157 people have been infected with Ebola in Guinea, 101 of whom have died.

The outbreak began in the forests of southern Guinea, but has spread to Conakry.

While the WHO has not recommended any trade or travel restrictions, the region is braced against the epidemic, with Senegal closing its border with Guinea.

AFP