The World Health Organization warned Thursday that Africa faced a "complex" Ebola outbreak after the virus crossed from east Africa to Nigeria, marking the first case in the west of the continent.

Nigeria, the continent's most populous nation, is the fourth African country affected by the outbreak.

The patient had recently traveled from Uganda to Nigeria.

Nigeria has recorded its first case of Ebola during the current outbreak, the country's health ministry has said - as the virus continues to spread internationally.

Case in Africa’s most populous country was detected in a woman who had travelled from UgandaNigeria has confirmed an Ebola case in its capital, Abuja, after a woman who arrived from Uganda tested posi

Nigeria has confirmed its first Ebola case in Africa's latest outbreak, while Kenya reported its ninth infection, raising fears of further spread across the continent. Africa CDC chief Jean Kaseya war

The WHO said that the imported case detected in Kenya, which came after travel, underscores the risk of international spread.