The deadly Ebola virus which has killed hundreds of people in West Africa is mutating at a rate which could hamper efforts to find a cure, researchers have warned.
Genetic studies of some of the earliest Ebola cases in Sierra Leone have found more than 300 changes in the virus as it moved from person to person.
The findings, published in Science, suggest current diagnostics and potential treatments and vaccines may struggle to keep up.
The study examined samples from 78 people in Sierra Leone, where the infections could all be traced to one faith healer who claimed to have found a cure, attracting affected patients from Guinea.
UK trials of a vaccine for the Ebola virus began today - but some experts complain that the response has been a long time coming.
A Swansea doctor who took leave to treat Ebola patients in Africa, is back on the wards after three weeks in isolation.
The first British case of Ebola in the outbreak in West Africa has been confirmed. So how would repatriation work are what are the risks?