Public health professionals work to prevent disease and promote good health in the community and eliminate inequalities in health. Much of the improvement in health since the 19th century has been because of public health work.
The Ministry of Health plays the lead role in public health, but many other organisations such as local councils and Plunket also do significant public health work.
In the 19th century public health focused on controlling infectious diseases by:
- quarantining (isolating) people coming into New Zealand with diseases
- improving sewerage systems.
Later, drinking water was treated, but not until the 1950s for most communities.
Poor housing and overcrowding can cause illness, which is one reason the government began to build state houses in 1906. In the 2000s the government ran a scheme to encourage people to insulate their homes.
Laws were introduced to reduce air pollution, which can cause respiratory diseases, but it was still a problem in the 21st century.
From the 1950s there were campaigns and laws to discourage smoking, which causes diseases including cancer.
From the mid-19th century vaccines were developed to prevent infectious diseases. In the 2010s children had free access to vaccinations that provided protection against 13 different infectious diseases. Public health actions have also included broad population-level approaches to address non-infectious causes of disease.
- providing free milk for schoolchildren from 1937 to 1967
- reducing tooth decay by adding fluoride to drinking water
- increases in tobacco excise tax and laws introducing smoke-free public places and workplaces
- legislation and public education campaigns discouraging drink-driving
- screening at-risk women for cervical cancer or breast cancer.
Around 47% of New Zealanders experience some form of mental illness at some time in their life. From the 1970s there was a new focus on programmes that promoted mental wellness, rather than just treating illness. Because Māori and Pacific Island people have higher rates of mental illness than other groups, programmes and services to support them were developed.
More people die by suicide each year than in car crashes. Suicide prevention is a major public health concern.
Social and ethnic factors
Māori, Pacific Island people and those on low incomes are likely to have poorer health than others. Encouraged by public health practitioners and others, governments have developed policies and programmes to reduce or eliminate these health inequalities.