The measles mass immunisation campaign has started in the Northern Division.
It is already underway in the Central, Western and Eastern Divisions.
Teams will also go house to house to immunise people in the target groups.
There are now 21 confirmed cases of measles in Fiji.
The Health Ministry says all patients are in stable condition and most have been treated and sent home.
The 21 cases to date are from the following areas in the Central Division:
-12 cases from the Serua/Namosi Subdivision (Wailali, Wainadoi, Navunikabi, and Makosoi Deuba)
-4 cases from Suva Subdivision (Samabula, Vatuwaqa, Tacirua, Wailekutu)
-4 cases from Rewa Subdivision (Koronivia, Nasilai Village Nakelo, Davuilevu)
-1 case from Naitasiri Subdivision (Saumakia Village)
