The UK medicines regulator has given approval for an experimental vaccine to be tested on healthy adults.

A new vaccine to tackle Ebola will now be tested on people after the UK regulator gave permission for trials to take place. Scientists at the University of Oxford started developing the vaccine eight weeks ago when a public health emergency was declared on 17 May. It is the first - out of four vaccines under development - to enter clinical trials. Volunteers are being recruited, with the first doses expected to be given to healthy adults in the UK "within weeks". The Ebola epidemic, centred on the Democratic Republic of the Congo has killed 625 people with 1,792 laboratory confirmed cases. It is caused by the Bundibugyo species of Ebola, which has started two outbreaks before. The six different species of Ebola are known as "sisters rather than twins" because while they are similar, they need separate treatments and vaccines. It means there are no approved drugs or vaccines this time. The outbreak is still not under control and is taking place in a conflict zone with very mobile populations – heightening the need for a vaccine to help stop the spread of disease.