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A nurse infected with Ebola was tested 7 times at Heathrow before being cleared to fly home to Glasgow, it emerged on Tuesday, as Britain's first line of defence against the virus was branded "shambolic".

Professor Dame Sally Davies, chief medical officer for England, told Today's Jim Naughtie: "Clearly there were some process issues. We're trying ...to pick up anyone who has active disease. You can't pick up people who are incubating the disease."

"Unless you're taking their blood they're not infectious."

First broadcast Today programme 31 December 2014.