50 people have been infected with type-4 dengue in New Caledonia since the beginning of this year amid very hot and humid weather.
There are four different types of the day-biting mosquito-borne disease and anyone can be infected once with each type.
Last year, more than 1,000 people were diagnosed with type-1 dengue in the territory and one woman died.
Our correspondent, Claudine Wery, says officials are worried about the new outbreak and are raising community awareness.
"Health authorities ask the population to be very watchful, to use repellent and to destroy all larvae shelters. As soon as someone has dengue, insecticides are sprayed around the house. Small villages, especially on the eastern coast, are not prepared to do that."
Claudine Wery says officials are refraining from universal spraying campaigns because mosquitoes became resistant to the chemicals in the past.