A 12-year-old girl is among five people in the UK who have contracted swine flu after visiting Mexico, the Prime Minister, Gordon Brown, has confirmed.
Two adults - one from Birmingham and one from London - are also undergoing treatment, as are the two previously confirmed cases in Scotland.
The girl's school, Paignton Community College in Devon, has shut and pupils will be offered anti-viral drugs.
Mr Brown said all those with the virus were responding well to treatment.
The number of swine flu cases globally is rising and the US has confirmed that the death of a 23-month-old child there is the first fatality outside Mexico.
In Scotland, the BBC understands that tests proved negative on seven people who had come into contact with a couple from Polmont, near Falkirk, who were the UK's first confirmed cases.
The results of tests on two more of the original contact group
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