But no prisoner or staff member at Whanganui Prison, based in Kaitoke, had yet returned a positive test result for Covid-19, a Corrections spokesperson said.
All six prisoners had returned a negative rapid antigen test result as of Friday afternoon.
The DHB anyone who had symptoms of Covid-19, including a runny nose, headache, fatigue, sneezing or a sore throat to isolate and arrange to be tested.
Tests are available at the CBAC - Community Based Assessment Centre, on the Whanganui
Hospital campus located at 100 Heads Road.
Tests may also be available at select GP's and pharmacies for people with Covid-19 symptoms.