The Waikato District Health Board has declared flu season officially kicking off after a spike in the number of reported influenza-like-illnesses.
"Influenza season has started in Waikato, with a number of our general practices and hospitals treating people for influenza-like-illnesses and respiratory infections," said Dr Anita Bell.
"The only way to protect yourself and your loved ones is to get vaccinated."
Figures show the dramatic rise occurring over the last month, numbers nearly doubling from mid 50s to just under a 100 cases, a report dated July 5 by clinical microbiologist Dr Chris Mansell shows.
All cases detected in the week to July 5 were from the Waikato region, with just over half the cases being found at Waikato Hospital's emergency department and one third from inpatient wards.