Health workers carry the body of an Ebola virus victim. (Reuters)
The World Health Organisation says the transmission of Ebola remains "intense" and widespread in Sierra Leone, even as some improvements are being seen in the two other countries worst hit by the crisis.
Nearly 200 new cases were confirmed in Sierra Leone's capital in a recent one-week period.
The WHO report released late on Wednesday indicated that Sierra Leone had the lowest percentage of Ebola patients who had been isolated - only 13 percent.
The disease is spread through direct physical contact with the bodily fluids of sick people and bodies, making it crucial that those who are contagious are placed into isolation.
WHO said that at least 1,250 people, including seven of the country's doctors, have died in Sierra Leone since the outbreak there began earlier this year.