The Auckland Regional Public Health Service has identified a probable second case of swine flu in South Auckland.
It follows the closure of a Papatoetoe child care centre after a one-year-old tested positive for the virus.
One confirmed case of Influenza A has resulted in a probable diagnosis of swine flu, with further testing to confirm whether it is in fact the virus.
The baby confirmed as having swine flu travelled to Melbourne a few weeks ago.
Public health services in Auckland are now contacting passengers who travelled on that flight who may have been exposed to swine flu.
The child centre has been closed until further notice and a further 11 swabs will be processed overnight.
There are currently 13 confirmed cases of swine flu in New Zealand.