It can lead to life-threatening conditions such as meningitis and blood poisoning.
“There are no close contacts in the school community from this case, or from another student who was suspected of having meningococcal disease during the school holidays.
“Health New Zealand is working to confirm if there is a link between the two cases.”
The letter said the risk of other students or staff catching the illness was considered low, and families did not need to take any action.
HNZ would provide more information to the school if the risk level changed. However, people were urged to be alert to the symptoms of meningococcal disease in students or family members.
These included:
At the start of the illness, meningococcal disease could feel like the flu or a cold, but could become worse very quickly, the HNZ letter states.
“If you or your child has symptoms you are worried about please contact your usual doctor or call Healthline for free anytime on 0800 611 116. In an emergency call 111.
“If your child develops the symptoms of meningococcal disease or becomes suddenly unwell, do not wait – seek health advice immediately.”
Rosmini College headmaster Nixon Cooper said he received the letter from HNZ last night and sent it to the school community this morning.
He declined to provide further details about the student who had tested positive, due to privacy considerations.
He was pleased no close contacts had been identified and that HNZ had assessed the risk to other students and staff as low.
Cooper said he believed the other suspected case related to a male student whose sister had contracted the disease about six or seven weeks ago.
She was a student at another school and had become “severely” unwell.
A Ministry of Education spokeswoman said: “Health matters relating to meningococcal disease are led by Health New Zealand, which is responsible for public health investigation, contact tracing, and providing advice to affected communities.”
‘False sense of security’
The Herald is seeking comment from Rosmini College, Health NZ and the Ministry of Education.
RNZ reported last month on the death of Kyla Te Wano Greensill from meningococcal disease.
The gifted volleyball player had represented Aotearoa New Zealand internationally, including as a member of the Volley Ferns.
Her parents said the young woman did not have some of the symptoms associated with the illness and had “deteriorated rapidly”.
Her sore neck, muscles and joints were attributed to sport and recovery.
Greensill became extremely cold and struggled to warm up but then appeared to improve, her parents said.
“She ate dinner, was up talking and watching television, and seemed to be getting better. That gave us a false sense of security.“
However, she then went downhill fast.
“The time between calling the ambulance and facing our new reality was frighteningly short. Meningococcal disease took our girl incredibly quickly.“
Her parents said they encouraged people to be vigilant when someone had flu-like symptoms and appeared unusually unwell.
“Trust your instincts. If someone seems seriously unwell, seek medical help. Don’t wait for a rash or for every symptom you associate with meningococcal disease to appear. Don’t worry about making a fuss.”
Lane Nichols is Auckland desk editor and a senior journalist for the NZ Herald with more than 20 years’ experience in the industry.
Sign up to The Daily H, a free newsletter curated by our editors and delivered straight to your inbox every weekday.