Health authorities in Ghana are testing blood samples from a 12-year-old girl who died of a viral fever with bleeding in the country's first suspected case of Ebola, Reuters reports.

More than 90 people have died of Ebola in Guinea and Liberia and there is a reported case in Mali. Medical charity Medicins Sans Frontieres has warned of an unprecedented epidemic in an impoverished region with weak health services.

Samples from the girl were taken from the Komfo Anokye Teaching Hospital in Kumasi, Ghana's second-largest city, to a medical research centre in the capital Accra, Dennis Laryea, head of public health at the teaching hospital, told Reuters.

The outbreak in Guinea is the first time the disease, epidemics of which occur regularly in Central Africa, has appeared in the country. Infected patients initially went undiagnosed for several weeks before tests confirmed Ebola.