Officials are trying to contain an Ebola outbreak which has spread to a major urban population in the Democratic Republic of Congo.
The World Health Organisation says vaccinations will begin today in a key test for an experimental vaccine - as the death toll continues to climb.
The medical charity Médecins Sans Frontières/Doctors Without Borders (MSF) says it's a very worrying situation.
It's the ninth Ebola outbreak in the Democratic Republic of Congo since 1976 when scientists first identified the deadly virus.
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