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Health Minister Tony Ryall has this evening confirmed ten positive influenza results from testing carried out on 13 Rangitoto College students who returned from Mexico early yesterday morning.

"Ministry of Health officials advise me there is no guarantee these students have swine influenza, but they consider it likely. All precautions are being taken to allow for this. However, I am also informed none of the affected patients are considered seriously ill, and most in fact seem to be on the road to recovery," said Tony Ryall.

"I am advised ten students have tested positive for Influenza A, and these results will now be sent to the World Health Organisation laboratory in Melbourne to ascertain whether it is the H1N1 swine influenza."

H1N1 influenza is a subset of influenza A.

A timeline when those results will be available will be advised, however it is expected given the global situation that they will be treated with considerable urgency.

Other passengers on NZ1, the flight the Rangitoto College students returned on, are encouraged to consult with their GP or other health professional if they develop flu-like symptoms.

Tamiflu has been released from Middlemore Hospital to the Auckland Regional Public Health Service to treat patients and those who have had contact with them.

7:52pm

The health minister and the national co-ordinator of pandemic planning are about to hold a press conference to reveal results of tests on students for potentially fatal swine flu.

The group of students from Rangitoto College on the Auckland's North Shore arrived back from Mexico with flu-like symptoms.

They have been in "home isolation" since arriving back yesterday. The three teachers and 22 senior students had been on a three week language trip.

Health Minister Tony Ryall, Director of Public Health Dr Mark Jacobs, and Steve Brazier, National Co-ordinator, Pandemic Planning have organised a press conference in Wellington tonight.

More than 80 people in Mexico are believed to have died and over 1300 are sick as a result of catching swine flu. Cases have also been reported in New York, California and Kansas and a British Airways pilot has been hospitalised in London with flu symptoms after returning from Mexico.

Scientists have warned for years about the potential for a pandemic caused by viruses that mix genetic material from humans and animals.

Auckland Regional Public Health Service (ARPHS) said today some of the group had symptoms of an influenza-like illness and were remaining in home isolation as a precaution while tests to exclude or confirm swine influenza were carried out.