The Cook Islands now says it has eight suspected cases of swine flu while three cases were earlier confirmed.
The confirmed cases are all of people arriving from overseas, and the hospital health services director, Heather Webber-Aitu, says they have been quarantined and treated.
Ms Webber-Aitu says many people are suffering from seasonal influenza, but test results are due back from Porirua to show whether's more of the swine variety.
"We've had three returning Cook Islands people from New Zealand [with confirmed swine flu]. We currently have eight swabs in the pipeline awaiting results anyday soon to see whether we had any other [cases]. To date there's no human to human pass on contact within the Cook Islands that we know of."
Heather Webber-Aitu says the Cook Islands has anti-virals to treat about 30 percent of the population.