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Health officials are undertaking a major study to find out how many New Zealanders have had swine flu.
Scientists are trying to determine the level of immunity in the country to the H1-N1 virus, and plan to take blood samples from 2500 randomly chosen people.
A pilot study has already started at the Ropata Medical Centre in Lower Hutt, in Wellington.
Dr Stewart Reid says there is a reluctance to take part and contacting people via telephone is proving difficult.
"It's been rather more time-consuming and difficult to get people involved than we'd originally expected."
Dr Reid says the researchers thought more people would have been willing to be involved.
He says it's too early to gauge the level of immunity in the community.
Scientists are trying to determine the level of immunity in the country to the H1-N1 virus, and plan to take blood samples from 2500 randomly chosen people.
A pilot study has already started at the Ropata Medical Centre in Lower Hutt, in Wellington.
Dr Stewart Reid says there is a reluctance to take part and contacting people via telephone is proving difficult.
"It's been rather more time-consuming and difficult to get people involved than we'd originally expected."
Dr Reid says the researchers thought more people would have been willing to be involved.
He says it's too early to gauge the level of immunity in the community.
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