A Sierra Leone woman who fled hospital after testing positive for the Ebola virus has died after turning herself in, health officials tell the BBC.

Scientists say they have stumbled upon a common virus that has never been described before.

All entries into Nigeria are placed on red alert after the authorities confirm the first death from the Ebola virus in the capital Lagos.

A British team of researchers has developed what might be a simple blood test for cancer, scientists from the University of Bradford say.