Global health experts at the World Health Organization (WHO) are meeting to discuss new measures to tackle the Ebola outbreak.
The meeting - being held in Geneva, Switzerland - is expected to last two days and will decide whether to declare a global health emergency.
The outbreak began in February and has since spread to four African countries, claiming nearly 900 lives.
On Wednesday a nurse became the second person to die from Ebola in Nigeria.
Nigeria's health minister said five other cases of Ebola were being treated in isolation in Lagos, sub-Saharan Africa's largest city.
It comes as leading infectious disease experts have called for experimental treatments to be offered more widely.