Three people were sent home from the Glastonbury music festival with suspected swine flu on Saturday, organisers said.
Two students at British universities, and a 10-year-old child from a family of four were all taken from the festival attended by more than 170,000 people to isolation facilities. They then returned to their homes.
Festival spokesman Christo Hird said: "Three unconnected people were taken off site, straight to an isolation unit on the advice of the doctor and have now gone home.
"They presented with symptoms. All medical staff have been fully briefed. The view of the chief medical officer is that they had this before turning up.
"This was anticipated. There is no more risk here than anywhere. The figure of three in 177,000 people is regarded as very low," Hird added.
Britain has more than 4,000 confirmed cases of swine flu so far, and the country's chief medical officer has warned that it could be see tens of thousands of cases within a few months.
The World Health Organisation says nearly 60,000 cases of the disease have been recorded worldwide, with 263 deaths.