The current outbreak has caused more deaths than any other on record, said an official from the Doctors without Boarders charity.
Ebola has been linked to more than 330 deaths in Guinea, Sierra Leone and Liberia, according to the latest numbers from the World Health Organization.
'The reality is clear that the epidemic is now in a second wave,' Janssens said. 'And, for me, it is totally out of control.'
The outbreak, which began in Guinea either late last year or early this year, had appeared to slow before picking up pace again in recent weeks, including spreading to the Liberian capital for the first time.
'This is the highest outbreak on record and has the highest number of deaths, so this is unprecedented so far,' said Armand Sprecher, a public health specialist with Doctors Without Borders.
According to a World Health Organization list, the highest previous death toll was in the first recorded Ebola outbreak in Congo in 1976, when 280 deaths were reported.
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