Published Friday, 05 June 2009
A man recently back from New York is the patient. He has been given anti-virals and is at home and recovering well.
The people he has been in contact with are also being treated.
The Public Health Agency is tracing passengers sitting close to him on the 11am BMI flight from London Heathrow to Belfast City Airport on Tuesday.
Health Minister Michael McGimpsey said: "I would again urge the people of Northern Ireland not to be alarmed. Given the increasing number of cases worldwide, we can probably expect to see more here.
"We are well prepared to deal with the emerging situation and will ensure we maintain a high state of readiness for any potential pandemic."
On Tuesday a student who had recently returned from England was also diagnosed with the illness.
The number of people with swine flu in the UK is nearing the 500 mark.