Ebola is spreading exponentially in Liberia, with thousands of new cases expected in the next three weeks, the World Health Organization (WHO) says.
Conventional methods to control the outbreak were “not having an adequate impact”, the UN’s health agency added.
At least 2,100 people infected with Ebola have died so far in the West African states of Guinea, Liberia, Sierra Leone and Nigeria this year.
The WHO says 79 health workers have been killed by the virus.
Organisations combating the outbreak needed to scale-up efforts “three-to-four fold”, the WHO said.