Just 39 per cent of workers at Nelson Marlborough District Health Board have been vaccinated against flu, the lowest rate in the country.
The Ministry of Health has released figures on the number of staff who had the flu jab as the healthsystem struggles with winter illnesses.
They showed only 54 per cent of DHB staff nationwide had.
That is despite predictions of a massive winter illnesses season, which is already contributing to long wait times in emergency departments in all the major centres.
There were four other DHBs with fewer than half of their staff vaccinated - Southern (44 per cent), South Canterbury (47), Counties Manukau (47) and Lakes (48).
Northland, Waikato, Taranaki, Hawke's Bay and Auckland all had rates in the low fifties.
Taranaki was offering perks and prizes to get its rate higher, including the chance to win a night in a luxury hotel.
The highest rate in the country was Tairāwhiti DHB which had 69 per cent of its staff vaccinated.
Ministry of Health national immunisation director Astrid Koornneef said it strongly recommended health workers get vaccinated against the flu for their own protection and to reduce the spread of flu to vulnerable patients.
Hospitals were working hard to get their rates up but it was not compulsory for staff to be vaccinated, she said.
