Symptoms can include stiff neck, painful limbs, bad headache, vomiting, fever, drowsiness, a baby refusing feeds, and a rash.
Urgent medical care should be sought for suspected meningococcal disease, which is readily treated with antibiotics if detected early.
Meningococcal disease is caused by a bacterium (germ) Neisseria meningitidis. It can cause meningitis (infection of the membrane around the brain) or septicaemia (blood poisoning).
It is a serious disease and can sometimes cause death or permanent disability, such as deafness. There are different groups of meningococcal disease - A, B, C, Y and W - but the signs and symptoms are the same for all.
Young children, teenagers and young adults are most at risk of this disease. The meningococcal C vaccination campaign aims to vaccinate at least 85 per cent of everyone in Northland aged 12 months to under 20 years. The campaign will run for a ten week period, from September 26 to December 16.
All children and young people in schools will be offered free vaccination, starting with high school students. Children 12 months to under 5 years will be offered vaccination by their family doctor (GP). Youth out of school under 20 years will be able to get the vaccine from their GP, or attend special clinics in their area.
Prompt treatment with antibiotics (usually by injection) can prevent death or permanent disability such as damage to the brain or deafness.
"Meningococcal disease can make you sick very quickly, so it is recommended, especially if your child is sick, that you should check them often and seek medical attention without delay," said Dr Mills.