Nearly a quarter of Whanganui residents have reported having had Covid-19, according to the Whanganui DHB.
But that figure is likely to be higher with many cases not being discovered, Whanganui medical officer of health Dr Patrick O'Connor said.
There were 57 new community cases of Covid-19 in the Whanganui region announced on Thursday by the Ministry of Health.
O'Connor said as of today 16,372 people had reported having Covid in the Whanganui DHB area.
"This didn't include those who hadn't recorded their test results, so it's undoubtedly an undercount," O'Connor said.