Published Tuesday, 02 June 2009
It is understood the patient is a young man who had recently been in contact with someone in England who had the virus.
He has been given anti-viral treatment and is said to be recovering well.
The Health Minister Michael McGimpsey has said selected passengers who were sitting close to him on a 7pm flight from London Heathrow to Belfast City Airport on Wednesday 27th May are being contacted.
The risk to public health is said to be low.
Mr McGimpsey said: "It is not surprising that we have seen a further case of swine flu and I would again urge people not be alarmed - this was to be expected.
"I am pleased to hear that the individual is recovering well at home.
"The public can be reassured that we have been preparing for a situation like this for some years and are well prepared for any potential pandemic.
"Our strategy to use antivirals to slow the spread of the virus also appears to be effective, as well as reducing symptoms.
"But we can not be complacent. We will continue to vigilant to ensure we are well-placed to deal with any emerging situation."
Meanwhile, three more cases have been confirmed in Ireland, bringing the total to seven.
Irish health officials said the latest patients are a man and a child from the west of the country and a woman from the east - all of whom returned recently from New York.
Chief Medical Officer Dr Tony Holohan said: "All the patients are aware of the confirmed test results.
"They are currently being treated at home and all necessary public health protection measures are being taken.
"These new cases are unconnected with the previous cases confirmed in Ireland."
Dr Holohan reiterated that the increasing number of cases was not a surprise and that the Department of Health and the Health Service Executive were well prepared.
Members of the public were again warned to take personal protection measures such as disposing of tissues and thoroughly washing hands.
The Department also asked people who have visited an area affected by swine flu and who become ill with flu-like symptoms to contact their GP by telephone and not turn up at a surgery or an accident and emergency unit.