Vanuatu has confirmed its first cases of swine flu in two local children.
Two out of 65 swab tests sent to a laboratory in Melbourne showed positive results for swine influenza.
The ministry sent another 16 tests to Australia this week.
The director of public health, Len Tarivonda, says it's unclear how the virus entered Vanuatu.
"There's no history of travel for the two children, but this is something that we are worried about that the first two cases were not in people that came into the country but local people. So it's difficult to tell, but perhaps there are more cases out there if these cases are anything to go by."
Len Tarivonda says they have stepped up their public awareness and are continuing to monitor all arriving passengers at the airport.