Nigerian authorities have put health workers on red alert following the resurgence of Ebola epidemic in Guinea.

Health Minister Osagie Ehanire said they would monitor all entry points to pick out any suspected cases, local media reports.

He said Nigeria was ready to send volunteers to support the World Health Organization's measures to contain the spread of the disease in Guinea.

The minister said they were following developments in Guinea with concern.

Guinea has registered a fourth death linked to the disease.