Bay of Plenty health authorities are reminding people to check they are up to date with immunisations.
Since November 2017, across the Bay of Plenty and Lakes districts there have been 217 cases of whooping cough notified to the local medical officer of health.
Whooping cough (also called pertussis) can be a serious disease. It is caused by bacteria that are easily spread by coughing and sneezing, Dr Natasha Murray, Medical Officer of Health for Toi Te Ora Public Health.
"Symptoms usually start with a runny nose and dry cough. The coughing gets worse and can be followed by a gasping breath in or 'whoop', and sometimes vomiting," Dr Murray said.
Babies under one year old are most at risk of serious complications from whooping cough. They are often unable to feed or breathe properly so become very ill and may end up in hospital.