Dr Bell said people who have not yet been vaccinated should book an appointment with their general practice immediately as the vaccine is only available until July 31.
"For those most at risk the vaccine is available for free, so check with your doctor," said Dr Bell.
"Influenza is a potentially serious viral infection that's much worse than a cold. Although some of the symptoms are the same, influenza is usually much more severe.
"Influenza can be severe enough to require hospital treatment, particularly in the very young, elderly, and in people who already have health problems," said Dr Bell.
Influenza will affect up to one in five New Zealanders every year and approximately 400 deaths each year in New Zealand are related to influenza infection.
The virus spreads easily and hand hygiene and cough etiquette are effective ways to reduce the spread, but the vaccine remains the most proven way to ward of the flu.
Tips to avoid catching the flu
If you feel unwell you can help reduce the spread of the virus by:
• Staying at home if you are unwell.
• Covering your cough or sneeze using disposable tissues.
• Regularly washing your hands thoroughly with soap and hot water, and then dry your hands with a clean dry towel or paper towel.
• Contact your GP or local medical centre to get the influenza vaccine.
* Further information on general hygiene and influenza can be found at: 0800 Immune (0800 466 863) or Healthline on 0800 611 116.
