Nine British school pupils have so far been diagnosed with swine flu in Beijing, according to Chinese health officials.
Nine US teenagers are also being treated in hospital after contracting the virus.
None of the children is thought to be seriously ill.
China has this year quarantined hundreds of foreign visitors who have shown symptoms of swine flu.
More than 600 Britons are on the two-week cultural exchange trip, organised by the Specialist Schools and Academies Trust, the Department for Children, Schools and Families, the British Council and Chinese organisation Hanban.
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