The first case of swine flu has struck Downing Street and it nearly caused a diplomatic crisis.
Gordon Brown's senior climate change adviser Michael Jacobs was banned from attending the G8 summit in Italy for fear he would pass the contagious disease to Barack Obama and other world leaders.
It is understood that Jacobs contracted the disease while involved in climate change talks in Mexico.
He had travelled to Rome for some preliminary negotiations on the draft of the G8 communique text, and was told by his personal doctor that he was no longer suffering from the disease. He then planned to travel to the conference site in L'Aquila, Italy, but was told by Brown that he could not risk him going.
The prime minister told Jacobs it would be diplomatically disastrous if Britain was responsible for infecting the G8's leaders. Instead, Jacobs followed negotiations by phone.
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