Cases in West Africa's Ebola outbreak this year have risen to 2,240, including 1,229 deaths, the World Health Organisation (WHO) said on Tuesday, reporting the toll in four countries, including Nigeria. While Nigeria, Africa’s most populous nation and No. 1 oil producer, appears to be containing its smaller outbreak, Liberia and Sierra Leone are struggling to halt the spread of the deadly Ebola virus among their populations. On Friday, these small two West African nations and a medical charity chided the WHO for its slow response, saying more action was needed to save victims threatened by the disease and hunger.