Vaccines developed to tackle Ebola outbreak in West Africa
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Efforts are ongoing to develop vaccines for the deadly Ebola virus disease which has claimed more than 4, 500 lives in West Africa.
According to the World Health Organization (WHO), there are at least 9,000 Ebola cases in Guinea, Liberia and Sierra Leone.
There is concern around the world that the virus may spread from West Africa to other countries as people travel by air.
Derrick Mbatha reports.
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