In a statement, the UN health agency said the Sierra Leone Government acted rapidly to respond to this new case.
Meanwhile, through the country’s new emergency operations centre, a joint team of local authorities, WHO and partners are investigating the origin of the case, identifying contacts and initiating control measures to prevent further transmission.
While WHO had declared West Africa free of Ebola transmission yesterday in a statement, it had also stressed that Guinea, Liberia and Sierra Leone remain at high risk of additional small outbreaks in the coming months due to the virus persisting in survivors after recovery.
"We are now at a critical period in the Ebola epidemic as we move from managing cases and patients to managing the residual risk of new infections,” said Dr. Bruce Aylward, WHO’s Special Representative for the Ebola Response, on Thursday.