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"Ministry of Health officials advise me there is no guarantee these students have swine influenza, but they consider it likely," he told reporters.

"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," Ryall said.

He said 10 positive results for influenza A had been obtained from testing carried out on 13 students from  Rangitoto College, Auckland, who returned from Mexico early Saturday morning.

"These results will now be sent to the World Health Organisation laboratory in Melbourne to ascertain whether it is the H1N1 swine influenza," Ryall said.

He said other passengers on the overnight Air New Zealand flight from Los Angeles to Auckland which the students travelled on should consult a doctor if they developed flu-like symptoms.