The government's chief scientific advisor says infectious diseases are a "global grand challenge" amid new warnings about the deadly Ebola virus.
Speaking to the Telegraph, Sir Mark Walport said the increasingly "interconnected" meant such diseases were a "potential major threat" to Britons.
“We were lucky with SARS," he said. "But we have to do the best horizon scanning. We have to think about risk and managing risk appropriately.
“The government is keeping a close eye on the Ebola outbreak and they will be prepared.”
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.
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