Three cases of the measles have been linked to Queenstown Airport.
Two adults and a 13-month-old baby living in Queenstown, Wanaka and Christchurch have all been reported as having the highly infectious disease.
They all travelled through Queenstown Airport on 21 or 22 of March leading authorities to believe they all contracted the potentially fatal illness from somebody there.
Canterbury medical officer of health Dr Ramon Pink said the three are all recovering well.
He said they should know within the next week whether anybody else has contracted measles.
Dr Pink said it is now safe to travel through Queenstown Airport as the person who had the disease will no longer be infectious.