The aid agency, Mercy Corps, has warned that there can be no end in sight to the Ebola outbreak in the Democratic Republic of Congo unless "drastic action" is taken.
Health workers have been unable to contain the spread of the disease, spokesman Philippe Marcoux says, with about eight new cases every day.
Insecurity and mistrust have hampered the response. Three Ebola treatment centres have recently been attacked.
Mercy Corps says funds are urgently needed to pay for education programmes to help people understand how the disease is spread.
More than 1,000 people have contracted the virus during the current outbreak, which is the second-largest ever recorded.
More than 600 people have died since last August.