Earlier this month Dr Mills said the Northland DHB was monitoring the situation following an increase in meningococcal disease, with six cases so far this year at that stage compared with three in 2014 and four in 2013.
"We want people to be aware it is still around," she said.
Almost all the patients had been admitted to Whangarei's Intensive Care Unit, some suffering neurological problems as a result of their illness.
An outbreak of meningococcal C disease claimed three lives in Northland in 2011, prompting the emergency vaccination of 32,410 children and youths. Between 2004 and 2006 a free MeNZB vaccination was offered to everyone under the age of 20 to protect against an epidemic of a specific strain of meningococcal B. The last phase of that programme, the immunisation of people with a high medical risk, ended in March 2011.
"Meningococcal disease can look like a viral flu or mild illness at the start, but can rapidly become life-threatening, especially in babies and young children," Dr Mills added.
"If your baby is unwell, please see a doctor and watch out for danger signs such as fever, vomiting, refusing to breast feed or fast breathing. Older children and adults may complain of headache, and have a fever and vomiting.
"The tell-tale purplish rash may not present until very late in the illness, so don't wait if you are concerned."
Meningococcal disease could be difficult to diagnose because it could look like other illnesses, such as the flu. It had a range of general symptoms, including a high fever, headache, sleepiness, joint and muscle pain. There could also be more specific symptoms, such as a stiff neck, a dislike of bright lights, vomiting, crying, refusal to feed (in infants) and a rash consisting of reddish-purple pin-prick spots or bruises.
"If you or anyone in your family has these symptoms, call your doctor straight away," Dr Mills said.
"You can also call Healthline free on 0800 611-116, 24 hours a day, even if you have already been seen by a health professional. If you have seen a doctor and gone home, but are still concerned, don't hesitate to call your doctor again or seek further medical advice."