A Liberian health worker who recovered from ebola after receiving an experimental drug has urged the manufacturer to speed up production for Africa.

Physician's assistant Kyndy Kobbah is expected to be released from hospital shortly after she survived the disease, which has been fatal in more than half the cases sweeping West Africa.

She urged the manufacturer of the drug known as ZMapp to step up production. The company has said that would take months.

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"They need to make more ZMapp and send it to us," Kobbah said.