Explained: What Covid 19 coronavirus vaccines mean for immunity in New Zealand 7 Mar, 2021 01:09 AM 7 minutes to read Director general of health Dr Ashley Bloomfield has indicated a vaccination target of 70 per cent of New Zealand's population. Photo / AP Director general of health Dr Ashley Bloomfield has indicated a vaccination target of 70 per cent of New Zealand's population. Photo / AP How much protection will NZ's four Covid-19 vaccines give us? Will regular shots be needed? Will they work differently in Maori and Pacific people? And does our virus-free environment have implications for immunity? Jamie Morton explains. Similarly, yet differently. New Zealand has pre-purchased four vaccines - from Pfizer and BioNTech; Janssen Pharmaceutica; Novavax; and AstraZeneca - and they're based on various technologies.