Otago Southland medical officer of health Dr John Holmes said yesterday the seven were contacts of a possible case of Influenza A (H1N1) while travelling from Los Angeles to Auckland last Wednesday.
A North Island person on that flight is being treated as a suspected case of the flu, and passengers seated near that person were being traced as a precaution.
None of the seven was showing flu symptoms and all had been offered Tamiflu.
They would be in voluntary quarantine until tomorrow and, unless they developed symptoms, would then be free to resume normal activities.
The location of the people has not been specified by Dr Holmes, other than that they are in several places in the region.
No further details about them would be released, in order to protect their privacy, he said.
Another person in the region who entered voluntary isolation late last week, after contacting a doctor because they felt unwell a week after being in what was described as "an area of concern", has been found to be negative to the Influenza A virus and is not considered to be infected with swine flu.
The 31 people who went into isolation in connection with the NZ1 flight on Anzac Day are now all out of quarantine.
None had flu symptoms.
Anyone concerned about the virus should phone either the national toll-free phone line 0800 358-5463 or their medical centre.
They should not just show up at hospitals or medical centres.
Symptoms of the flu are sudden onset of illness with a fever, sore throat, cough, headaches, body aches, chills and fatigue.
Swabs can determine whether the virus is present.
