The spread of the two-month-old outbreak, which Guinean authorities earlier said had been contained, risks further complicating the fight against the virus in a region already struggling with weak healthcare systems and porous borders.
Seven confirmed cases and nine suspect cases of ebola are being dealt with in Sierra Leone, the WHO announced on Thursday (May 29).
The announcement comes after the WHO said on Monday (May 26) that five people had died in the country's first confirmed outbreak of the virus, signalling a new expansion of the disease which regional officials said had been brought under control.
Ebola, a haemorrhagic fever with a fatality rate of up to 90 percent, is believed to have killed some 185 people in neighbouring Guinea and Liberia since March in the first deadly appearance of the disease in West Africa.
"For Ebola in Sierra Leone for the last few days we have a total reported of seven confirmed cases and nine suspect cases. All of them are reported in the Koindu district, which is in the Kailahun prefecture which is bordering Guinea, notably bordering Gueckedou, the first site of Ebola in Guinea," said Dr Pierre Formenty from the WHO's Department for the Control Of Epidemic Diseases.
Authorities had identified several ways the virus had been transmitted, but human to human was the most prevalent form.
"We have been able to identify several chains of transmission. One of them starts, I would say, in the forest. But more importantly, this chain of transmission have lasted for six months now, through contact, human to human transmission, so human contact. And again, through caring of people without precaution, through transmission within health care facilities, and through people attending funeral without precaution and being in contact of people dying of Ebola."
Dr Formenty said that the outbreak could be contained relatively easily as long as the population in affected areas followed advice from health officials.
"This outbreak in West Africa is primarily transmitted through human to human transmission. This is why it should be relatively easy to stop if the population is with us and understand that unsafe burial and unsafe care at home will help the outbreak to continue to spread and if you want to stop the outbreak we should develop safe behaviour."
The WHO said on Monday (May 26) it was deploying six experts to the area along with essential supplies.
The West African outbreak spread from a remote corner of Guinea to the capital, Conakry, and into Liberia, causing panic across a region struggling with weak healthcare systems and porous borders.
A total of 258 clinical cases have been recorded in Guinea since the outbreak was first identified as Ebola, including 174 deaths - 95 confirmed, 57 probable and 57 suspected - according to the WHO.
The disease is thought to have killed 11 people in Liberi
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