A disease that had nearly vanished from Australian life has killed again
A disease that modern medicine had all but erased from Australian life has claimed its first life in nearly a decade, as diphtheria spreads quietly through the Northern Territory and beyond. Since January 2025, 145 infections have been recorded across the NT alone, with the respiratory strain — capable of suffocating the untreated — accounting for 42 of those cases. The death, in a remote corner of the Territory, is less an anomaly than a consequence: where vaccination coverage thins, old dangers find their footing again. What was once a triumph of public health is now a reminder that prevention is not a permanent achievement but an ongoing obligation.
- A person has died from diphtheria in a remote NT community — the first Australian fatality from the disease since 2018 — as a months-long outbreak shows no sign of slowing.
- 145 cases have been confirmed across the Northern Territory since January 2025, with 42 involving the respiratory strain that can seal off a patient's airway and prove fatal without treatment.
- The outbreak is not contained: Western Australia has recorded 60 cases, while Queensland and South Australia have reported additional infections, suggesting the disease is moving across state lines.
- Vaccination rates appear to have eroded in the communities hit hardest, exposing a gap between the infrastructure of prevention and the populations most vulnerable to its absence.
- NT Health has launched a staged, territory-wide vaccination campaign targeting the highest-risk areas and working through community organisations to reach people where formal healthcare access is limited.
- The tools to stop diphtheria exist — the vaccine is free, antibiotics can treat infection — but the outbreak continues, and health authorities warn that without rising coverage, further deaths are likely.
A disease that had nearly disappeared from Australian life has killed again. In a remote region of the Northern Territory, a person died from diphtheria in recent weeks — the first Australian death from the illness since 2018, when an unvaccinated adult succumbed to its respiratory form. Autopsy results are still pending, but the signal is clear: diphtheria, long thought consigned to history, has returned.
The outbreak has been building since the start of 2025, with 145 cases documented across the NT. Of those, 42 involve the respiratory strain — the form that can close off the airway and suffocate an untreated patient. The disease spreads through coughs, sneezes, and contact with skin lesions, and it is not staying put. Western Australia has recorded 60 cases; Queensland and South Australia have reported cases too.
Vaccination is the most effective defence. The vaccine is free for anyone under 20 and for pregnant women, and children receive routine doses across their early years. Adults are advised to boost every decade. Yet the outbreak persists, pointing to gaps in coverage among vulnerable populations — communities where access to healthcare is limited and the infrastructure of prevention has worn thin.
NT Health has responded with a territory-wide vaccination campaign, staged to prioritise the highest-risk areas and delivered in partnership with community organisations. The message from health authorities is unambiguous: diphtheria is treatable, it is preventable, and it should not be killing Australians. But it is — and without a meaningful rise in vaccination rates, the risk of further deaths remains real.
A disease that had nearly vanished from Australian life has killed again. In a remote region of the Northern Territory, someone died from diphtheria a few weeks ago—the first Australian death from the illness since 2018, when an unvaccinated adult succumbed to the respiratory form of the infection. The Northern Territory's health department is still awaiting autopsy results to formally confirm the cause, but the signal is unmistakable: diphtheria, a bacterial infection that seemed consigned to history, has returned.
The outbreak has been building for months. Since the start of 2025, health authorities have documented 145 cases of diphtheria across the Northern Territory. Of those, 42 represent the respiratory strain—the dangerous form that can close off the airway and suffocate an untreated patient. The disease presents in two ways: it can attack the skin, producing sores, or it can settle in the throat and lungs, causing a sore throat that progresses to something far worse. It spreads the way respiratory illnesses do, through the coughs and sneezes of infected people, or through direct contact with their skin lesions.
John Boffa, the chief medical officer at Central Australian Aboriginal Congress, confirmed the death to the ABC. The outbreak is not confined to the Territory. Western Australia has recorded 60 cases. Queensland has reported two. South Australia has one. The disease, which had become so rare after vaccination programs took hold in the 1930s that most Australians alive today have never encountered it, is moving across the country.
Treatment exists—antibiotics can clear the infection—but prevention is what matters. The Northern Territory's health department has been explicit about this: vaccination is the most important measure for stopping transmission. The vaccine is free for anyone under 20 and for pregnant women past 20 weeks of gestation. Children receive routine doses at six weeks, four months, six months, 18 months, four years, and 12 years. Adults are advised to get a booster every decade. Yet the outbreak persists, suggesting gaps in coverage or in the immunity of vulnerable populations.
In response, NT Health has launched a territory-wide vaccination campaign. The approach is staged, beginning with the people most at risk and the areas where transmission is most active. The health department is working with community organizations to reach people where they are. It is a recognition that the disease has found its way into populations where vaccination rates lag, where access to healthcare may be limited, where the infrastructure of prevention has worn thin or never fully existed.
The death—one person, in a remote place, a few weeks ago—is the punctuation mark on a warning. Diphtheria is treatable. It is preventable. It should not be killing Australians in 2025. But it is, and until vaccination rates rise, it will likely kill again.
Citas Notables
Vaccination is the most important measure for preventing, protecting and reducing transmission— NT Health
La Conversación del Hearth Otra perspectiva de la historia
Why did diphtheria come back now, after so many years of absence?
The outbreak suggests vaccination coverage has dropped in certain communities, or that immunity has waned in populations that weren't revaccinated. It's not that the disease suddenly appeared—it's that the wall we built against it has developed cracks.
Is this person who died someone we know anything about?
Not really. They were in a remote region, and the health department is still confirming the cause. But the fact that they died tells us the disease was advanced enough to be fatal—which means it wasn't caught early, or treatment wasn't accessible.
The vaccine is free. So why aren't people getting it?
Free doesn't mean accessible. In remote areas, you might have to travel hours to a clinic. You might not know you need it. There might be distrust of health services. And for adults, it's easy to forget a booster that's supposed to happen every ten years.
How serious is the respiratory form?
It can suffocate you. If it's not treated, the infection creates a membrane in your throat that closes off your airway. That's why 42 respiratory cases out of 145 total is the number that keeps health officials awake.
What happens next?
The vaccination campaign will tell us whether the Territory can contain this. If coverage rises, cases should fall. If they don't, we'll see more deaths—and the disease will keep spreading to other states.