Young adult in Adelaide critical after meningococcal B infection, officials urge vaccine uptake

A young adult has been placed on intensive care in an Adelaide hospital after testing positive for invasive meningococcal B disease. This case is the 22nd reported in South Australia this year, up from 13 at the same point in 2025. Health Minister Blair Boyer and Chief Public Health Officer Nicola Spurrier are pressing residents to receive the meningococcal B vaccine, noting that roughly half of those eligible have been vaccinated so far. The vaccine is provided at no cost to children from six weeks to 12 months old and to Year 10 students, with young children identified as the most vulnerable group. Contact tracing has already identified seven close contacts, all of whom have been given preventive antibiotics to stop the bacteria from spreading further. The antibiotics work by clearing the organism from the back of the nose and throat, cutting off transmission. Meningococcal disease is caused by Neisseria meningitidis, a bacterium that exists in about ten percent of the population without causing illness. It can move into the bloodstream and brain after close or prolonged contact, leading to symptoms such as rash, headache, fever, vomiting, stiff neck and sensitivity to light, which can rapidly progress to confusion, shock and death within a day. SA Health warns that even with prompt care, up to one in ten infected individuals may die.

Context

Meningococcal B is one of the common strains targeted by routine immunisation programmes in Australia. Widespread vaccination reduces both individual risk and community spread, especially in settings where close contact is frequent. Early recognition of symptoms and swift medical treatment remain vital to improve survival chances.