Three people attending the Glastonbury Festival have been diagnosed with suspected swine flu.
Two students and a 10-year-old child from a family of four showed symptoms of the illness when examined by festival medical staff.
The students, from Exeter and Edinburgh universities, and the family were moved off the festival site and into an isolation facility.
After receiving advice they have now all decided to return home.
Dr Mark Salter, one of the 600-strong medical team at the festival, said: "This is generally a mild illness but we are taking no chances and strongly advising people with symptoms to leave the festival.
"Because of the number of people it is highly likely that we will see other cases, but we are fully prepared".