According to provincial disease control officer Maria Sabok, the result came from tests done at the Central Public Health laboratory in Port Moresby recently.
Sabok said health workers carried out a mass vaccination on 335 inmates including 154 officers and their families, and reported this case.
The inmate has been vaccinated.
She told TV Wan news that they have enough vaccines to continue the program.
The National Department of Health also reported measles being detected in the Gulf Province.