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More than a quarter of people surveyed in Ebola-hit areas of the Democratic Republic of Congo told researchers they do not believe the disease exists.
Some 36% of respondents also believed that the disease had been fabricated to destabilise the country.
The authors of the study, published in the Lancet, said this mistrust was a factor in prolonging the epidemic.
The current outbreak started in August and more than 600 people have died, according to the health ministry. Read more