He was also the first to be picked up by the thermal scanner at Changi Airport. The boy had been in Orlando and Atlanta in the United States on a school trip from May 17 to last Sunday.

His fever was detected by the airport scanners when he arrived Monday in Singapore from Atlanta via Mumbai. He had been feverish during the flight and was seated at 39K on Singapore Airlines SQ421.

A Health Ministry (MOH) statement said the boy was brought by a 993 ambulance to Tan Tock Seng Hospital (TTSH) but has been hospitalised at KK Women's and Children's Hospital (KKH).

He was sent there early Tuesday morning. Laboratory results at 2.40 pm on the same day confirmed he was infected by A (H1N1).

MOH said contact tracing is ongoing. Passengers within rows 37 to 41 on the same flight and have not been contacted by health authorities, should call its hotline at 1800-333 9999.

Contact tracing of all previous cases, except that of a 30-year-old Australian male tourist, have been accounted for.

Contact tracing for passengers on the same flight as the Australian tourist is still on going. Passengers within rows 52 to 56 on SQ25 arriving on Monday (Jun1) need to get in touch with MOH.

Read the full story in Wednesday's edition of The Straits Times.