Australia Records First Diphtheria Death in Eight Years Amid Largest Outbreak Since 1991

Australia has recorded its first diphtheria death since 2018 amid its worst outbreak of the disease in more than 30 years. A man who died in April at Royal Darwin Hospital was confirmed to have died from diphtheria. The country has reported 245 cases this year, mostly in remote Indigenous communities. Authorities have intensified vaccination campaigns, administering more than 10,400 doses, and announced AU$7.2 million to help contain the outbreak.

Australia is confronting its most significant diphtheria outbreak in more than three decades, with health authorities confirming the country's first death from the disease in almost 10 years. The development has heightened concerns among public health officials, who have intensified vaccination campaigns and awareness efforts in a bid to prevent further infections.
The outbreak was officially declared in March by authorities in Australia's Northern Territory (NT), following a sharp increase in reported cases that began in late 2025 and accelerated rapidly in February this year. Since then, infections have continued to spread across several parts of the country, with cases also recorded in Western Australia, South Australia and Queensland.
According to health data released by authorities, Australia has recorded 245 cases of diphtheria so far in 2026, making it the largest outbreak of the disease in the country since 1991. The majority of infections have been concentrated in remote Indigenous communities, where access to healthcare services can be more challenging and vaccination coverage may be lower than in major urban centres.
The outbreak took a more serious turn after health officials confirmed that diphtheria was responsible for the death of a man who died in April at Royal Darwin Hospital. The confirmation came after an autopsy was conducted and samples were analysed by an overseas laboratory. Northern Territory Health Minister Steve Edgington announced the findings on Tuesday, describing the situation as a matter of significant concern for public health authorities.
The death is the first officially linked to diphtheria in Australia since 2018 and serves as a reminder that the disease, although preventable through vaccination, can still be fatal when infections become severe or treatment is delayed.
In response to the outbreak, authorities have launched an extensive public health campaign aimed at increasing vaccination rates, improving awareness and limiting the spread of infection in vulnerable communities. Officials say these efforts are beginning to produce positive results, with the number of newly reported cases now showing signs of decline.
"Our government has taken this situation very seriously, and we are working hard to understand the causes and working to contain the situation," Edgington said while providing an update on the outbreak response.
He disclosed that more than 10,407 vaccinations had been administered since March 30 as part of the emergency immunisation campaign. Health officials continue to encourage residents, particularly those living in affected regions, to take advantage of vaccination services and booster programmes.
Data released by the Northern Territory government showed that between January 2025 and May 2026, the territory recorded a total of 163 diphtheria cases. Among these were 48 cases of respiratory diphtheria and 115 cases of cutaneous diphtheria.
Respiratory diphtheria affects the nose and throat and is regarded as the more dangerous form of the disease because it can interfere with breathing and may lead to severe complications. Cutaneous diphtheria affects the skin and spreads through direct contact with infected wounds or sores. While generally less severe, it can still contribute to transmission and requires medical attention.
The outbreak has not been confined to the Northern Territory alone. In March, health authorities in Western Australia confirmed two cases of respiratory diphtheria, marking the first occurrence of that form of the disease in the state in more than half a century. The cases raised alarm among health experts, given the rarity of respiratory diphtheria in Australia in recent decades.
Statistics indicate that approximately 60 per cent of all reported cases this year have occurred in the Northern Territory, while Western Australia accounts for about 36 per cent. A smaller number of infections have been detected in South Australia and Queensland.
Health officials have repeatedly stressed the importance of vaccination as the most effective means of preventing infection and reducing transmission. Authorities are particularly encouraging teenagers and adults to check their vaccination status, as immunity can decline over time and booster doses may be required to maintain protection.
To improve vaccine accessibility, the Northern Territory government has established temporary vaccination and information clinics in Darwin, Katherine and Alice Springs. These clinics are providing immunisations, educational materials and support to residents, especially in communities identified as being at higher risk.
According to NT Health, vaccination remains the most effective tool available for preventing infection, protecting individuals from severe illness and reducing the spread of the disease within communities.
Medical experts explain that both respiratory and cutaneous forms of diphtheria can be prevented through routine immunisation. In Australia, children typically receive five doses of the diphtheria vaccine between the ages of two months and four years. An additional booster shot is administered between the ages of 12 and 13 to strengthen immunity during adolescence.
Respiratory diphtheria often begins with symptoms such as fever, chills, fatigue and a sore throat. As the infection progresses, it can cause swelling in the throat, breathing difficulties and problems with swallowing. In severe cases, toxins produced by the bacteria can damage vital organs, including the heart and nervous system, making the disease potentially life-threatening.
Cutaneous diphtheria presents differently, usually causing infected sores, ulcers or skin lesions on exposed areas of the body. These wounds can persist for long periods and heal slowly, although they rarely result in life-threatening complications. Nevertheless, infected individuals can still transmit the bacteria to others.
Australia's national broadcaster, ABC, reported that the country's last recorded diphtheria-related death occurred in 2018. The latest fatality has therefore renewed public attention on the importance of vaccination and disease surveillance.
The seriousness of the outbreak prompted Australia's Chief Medical Officer, Prof Michael Kidd, to declare diphtheria a communicable disease incident of national significance last week. The declaration allows for a more coordinated national response and enables health agencies across the country to work together more effectively in monitoring cases, sharing resources and implementing prevention strategies.
To further strengthen the response, the Australian government announced a AU$7.2 million funding package dedicated to boosting vaccination programmes, increasing medical resources and supporting public health measures in affected communities.
Health authorities continue to monitor the outbreak closely and are urging Australians, particularly those living in high-risk regions, to ensure their vaccinations are up to date as efforts continue to prevent further infections and protect vulnerable populations from the disease.