The World Health Organization has declared an Ebola outbreak in the Democratic Republic of Congo to be a "public health emergency of international concern". Officials say at least 91 people have died in the central African country, and there are more than 350 suspected cases. The current outbreak of Ebola is caused by the Bundibugyo virus, for which there are no approved drugs or vaccines.
We ask the BBC’s health and science correspondent James Gallager how worried the world should be about the spread of Ebola.
The WHO chief Tedros Adhanom Ghebreyesus has said there are "significant uncertainties" about the scale of the outbreak. At least one person has died of Ebola in Uganda – the DRC’s neighbour to the northeast. Another neighbour, Rwanda, has increased screening at the border. And at least six Americans who were exposed to the Ebola virus in the DRC may be taken to a US military base in Germany for treatment.
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