New Zealand health officials are investigating a possible 56 further cases of swine flu.
Swine flu has killed at least 100 people in Mexico and the World Health Organisation has escalated its handling of the outbreak from a phase three to phase four plan saying there was now an increased risk of a pandemic.
New Zealand officials have said it was likely nine students and one teacher who returned to Auckland after a trip to Mexico on Saturday have contracted it.
A further 56 people who have recently returned from America or Mexico and have flu-like symptoms are being tested.
Health Minister Tony Ryall told a press conference in Wellington today it would be six to eight months before a swine flu vaccine could be produced.
