The patient is a 19-year-old Singaporean studying in the United States, who returned for the summer holidays.
She arrived in Singapore from New York via Tokyo on All Nippon Airways NH901 at 11:40pm local time on May 28.
She developed symptoms on Monday morning (June 1), and a 993 ambulance was called to send her to the Communicable Disease Centre (CDC) at Tan Tock Seng Hospital.
She was admitted to the CDC on the afternoon of the same day.
Laboratory results confirmed her infection at 9pm on Tuesday.
Singapore's Health Ministry (MOH) has assessed that no flight passengers needed to be quarantined as the case only developed onset of symptoms more than 24 hours after disembarkation, hence she was assessed to be non-infectious during the flight.
MOH added on Wednesday that tracing for the local contacts has been initiated.
So far, two close contacts involving the case's family members have been identified.
They are currently well and home quarantine orders will be served to them.
Tracing for other local contacts is on-going.
The Ministry said that so far, all the nine cases are imported and have a travel history.
There is currently no evidence of community spread.
MOH said it is monitoring the situation closely and will update the public on any new developments.
For more information on Influenza A(H1N1), please access MOH's website at www.moh.gov.sg, call the hotline at 1800-333 9999, or visit www.flu.gov.sg.
Source : http://www.channelnewsasia.com/stories/singaporelocalnews/view/433527/1/.html