The humanitarian charity Doctors Without Borders is struggling against an Ebola outbreak in Sierra Leone.
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In Sierra Leone, Medecins Sans Frontieres workers are battling an invisible enemy. Ebola.
The deadly disease has so far claimed more than 600 lives across west Africa, including dozens of health workers.
The fatality rate of the current outbreak is around 60 percent although Ebola can kill up to 90 percent of those who catch it.
(SOUNDBITE) (English) MSF WATER AND SANITATION SPECIALIST, SEBASTIAN STEIN, SAYING:
"To look over this fence right behind you now, and see and look at the patients and you know that their chances are very small. It's horrible."
There are now fears that the disease might spread globally.
On Wednesday, a woman was admitted to hospital in Hong Kong amidst fears that she had contracted the virus.
She tested negative, but city authorities say they are on high alert for a potential outbreak.
(SOUNDBITE) (English) CONSULTANT FOR COMMUNICABLE DISEASES, DEPARTMENT OF HEALTH, DR CHUANG SHUK-KWAN, SAYING:
"Any person who travelled from these three places to Hong Kong within the past 21 nights, uh, 21 days, who developed fever should be referred to the hospital. So the Hospital Authority has special arrangements to manage these patients."
The U.S. government says at present they see no significant threat from the disease. The UK government says it is confident it can contain any cases.
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