Ebola experts are in Sierra Leone’s Kambia district investigating a case that emerged less than a week after the country’s last known patient was discharged from a hospital, a World Health Organization spokeswoman said Monday. Once the source of transmission is found and contacts are traced, a vaccination trial will also begin in the northern Sierra Leone area, WHO spokeswoman Dr. Margaret Harris said.

“It’s a step back and a disappointment, but it wasn’t a surprise as it’s near the border with Guinea,” where cases remain, said Harris, adding that further transmission can be stopped. Samples from a 67-year-old woman’s corpse tested positive for Ebola, WHO technical coordinator Margarette Lamunu said. The woman, who died and was safely buried Aug. 29, was treated at home in Kafta village, so more Ebola cases are expected, Lamunu said.

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