(SKY News) -- The number of deaths and confirmed cases of ebola in west Africa has been vastly underestimated, the World Health Organisation (WHO) says.
The death toll from the outbreak currently stands at 1,069 people. There have been 1,975 confirmed, probable or suspected cases.
The majority of the cases have occurred in Guinea, Sierra Leone and Liberia. Four deaths have also been reported in Nigeria.
But the WHO said there is evidence that the number of reported cases underestimates the scale of the suffering.
"The outbreak is expected to continue for some time. WHO's operational response plan extends over the next several months," the WHO said in a statement.
"Staff at the outbreak sites see evidence that the numbers of reported cases and deaths vastly underestimate the magnitude of the outbreak."