The World Health Organization has declared the Ebola outbreak in Africa a public health emergency of international concern.
So far, 336 people have been infected in the central African and East African countries of Uganda and the Democratic Republic of Congo. At least 88 people have died.
Ebola is caused by a group of viruses called Orthoebolaviruses. The strain of the virus responsible for the outbreak, Bundibugyo, is rare. There is no vaccine to protect the public from its spread, making it particularly dangerous.
