A young man attending a camp on Auckland's Motutapu Island has died from a suspected case of meningococcal disease, prompting an emergency trip to the island by health authorities.

The man, who had been among 190 people attending the St John youth camp on the island this weekend, died in Auckland City Hospital last night.

Auckland Regional Public Health Service (ARPHS) has scrambled staff to the island to provide protective antibiotics and assess the risk to others, however only a few people were considered to be "close contacts" and at risk of infection.

ARPHS Medical Officer of Health Dr Denise Barnfather said a public health nurse and doctor have been to the island to give antibiotics to the young people who shared the same sleeping quarters and another person possibly exposed in the first aid room.

A friend of the young man was taken off the island as part of the medical evacuation last night, has been given antibiotics, but is not considered unwell.

"This is very tragic for the family of the young man who died, and for everyone at the camp," he said.

"The risk of the young people or staff being infected is very low, as the meningococcal bacterium is only spread by very close contact, or many hours of contact, with an infected person."

The other young people at the camp are safe and are being well looked after by St John, who were sending additional support staff.

The camp would continue until tomorrow and parents have been told of the young man, and given information on symptoms for when the young people return home," Barnfather said.

Northland's Public Health Unit was also talking to the family about who else might have been at risk in the previous seven days in which the young man was infectious.

"Meningococcal disease is a serious and sometimes fatal disease, and can be difficult to diagnose, so we are providing information to the young people and parents so they can be alert for symptoms," Barnfather said.

"It can look like the flu early on but quickly gets much worse. It is important to get early treatment."

Symptoms included some or all of the following: fever; headache; vomiting; feeling sleepy, confused and delirious; loss of consciousness; joint pains; aching muscles; stiff neck; dislike of bright lights; or rashes, purple or red spots, or bruises.

Other symptoms in babies and infants include being unsettled, floppy or irritable, refusing drinksand feeds, and becoming harder to wake.

"If you or anyone you know has these symptoms, don't wait."

People should phone a doctor or Healthline on 0800 611 116 immediately.

There was an average of 29 cases of meningococcal disease annually in Auckland, however numbers varied from seven to 47 in 2017.