We've never been told what it is
A disease once thought consigned to history has returned to Australia with a force that reveals the enduring geography of neglect. Since October, nearly 260 people — overwhelmingly Aboriginal and Torres Strait Islander men, women, and children in the Northern Territory — have contracted diphtheria, a bacterium that flourishes wherever poverty crowds people together and healthcare cannot reach them. One person has died, dozens have been hospitalized, and the outbreak continues to grow — not because the science failed, but because the systems meant to protect the most vulnerable were allowed, through deliberate policy choices, to decay.
- A disease absent from Australian headlines for decades has returned with its largest outbreak since records began, striking remote communities where ten people may share a single home and no one was told what was spreading among them.
- Vaccination rates among Territory adolescents have fallen to 67 percent and among adults to just 30 percent — far below the 95 percent threshold needed to stop transmission — while booster programs never reached the people who needed them most.
- The Territory's sole diphtheria testing laboratory can take up to a week to return results, nurse turnover runs at 148 percent annually, and Medicare funding freezes have shuttered GP clinics, leaving communities medically exposed as cases accelerated.
- Internal government data shows NT Health knew the outbreak was intensifying a full month before issuing any public alert in late March, and residents like Eugene Penhall of Yuendumu — a community of 700 — were still asking simply: 'What is this disease?'
- The federal government's eventual response — $7.2 million announced in late May, directed almost entirely at vaccination — left housing, testing infrastructure, and the healthcare workforce entirely unaddressed, the very conditions driving the spread.
Since October, Australia has been living through its largest recorded diphtheria outbreak — nearly 260 cases of a disease so rare it had come to feel historical. At least 60 people have been hospitalized, some in intensive care, and one person has died. The outbreak is concentrated in the Northern Territory and Western Australia, but its human face is sharply defined: Aboriginal and Torres Strait Islander people account for 95 percent of all infections.
Diphtheria spreads through the air and attacks both skin and airways. Its respiratory form — present in roughly a third of current cases — can produce thick membranes that choke off breath and kills approximately one in ten patients even with antibiotics. It is, at its core, a disease of poverty. It thrives in overcrowded homes, in communities where healthcare cannot reach, in places where the infrastructure of ordinary life has been allowed to fail.
The Northern Territory, despite its mineral wealth, contains some of Australia's most impoverished communities. Overcrowding exceeds 50 percent in remote Aboriginal settlements. Homes lack reliable cooling, electricity, and running water in temperatures that regularly surpass 40 degrees Celsius. A 2020 government warning identified a need for 12,000 additional homes by 2025; the current federal-territorial agreement plans fewer than 300 new public homes per year for the next decade.
Vaccination rates collapsed in the wake of the COVID-19 pandemic. Only 67 percent of Territory adolescents are adequately vaccinated, and just 30 percent of adults — far below the 95 percent threshold required to prevent sustained transmission. The healthcare system meant to close these gaps is itself in crisis: chronic workforce shortages, a nurse turnover rate of 148 percent annually in remote towns, closed GP clinics, and a single Territory laboratory for diphtheria testing that can take up to a week to return results.
When cases began appearing in October, no alarm was raised. Dr. John Boffa of the Central Australian Aboriginal Congress told the Guardian that health services were not adequately informed for months. When his organization went to town camps to vaccinate people, they found communities that had received almost no information about the disease at all. Eugene Penhall, a resident of Yuendumu — a remote community of 700 — put it plainly: 'We've never been told what it is.' Sufficient vaccine supplies took nearly two months to arrive. By then, 15 to 20 new cases were appearing each week.
Leaked internal statistics revealed that NT Health was aware of accelerating spread a full month before issuing a public alert in late March. The federal Labor government, aware of the situation well before that, took no emergency action until sustained pressure from health workers and community organizations produced a $7.2 million funding announcement at the end of May — directed almost entirely toward vaccination, with nothing allocated to housing, testing capacity, or healthcare infrastructure.
Diphtheria had been nearly eliminated from Australia for decades. Between 1999 and 2019, only eight respiratory cases were reported nationally. Its return is not a mystery. It is the consequence of deliberate choices — underfunded public health, decaying housing, collapsed remote healthcare — and, when the disease emerged, of suppressed information and delayed response. The outbreak continues.
Since October, Australia has been grappling with its largest diphtheria outbreak on record—nearly 260 cases of a disease that had become so rare it seemed almost historical. At least 60 people have required hospitalization, several in intensive care. One person has died, the first confirmed diphtheria death in the country since 2018. The outbreak is concentrated in the Northern Territory and Western Australia, but the numbers tell a story about who gets sick: Aboriginal and Torres Strait Islander people account for 95 percent of all infections.
Diphtheria is caused by a bacterium that spreads through the air, attacking the skin and respiratory tract. It comes in two forms—a milder cutaneous version affecting the skin, and a far more dangerous respiratory form that can produce thick grey membranes in the throat and airways, choking off breath. Even with antibiotics, respiratory diphtheria kills roughly one in ten patients, with children at highest risk. In this outbreak, about a third of cases have been the respiratory kind, consistent with historical patterns. The disease is, fundamentally, a disease of poverty. It thrives where people are crowded together, where housing fails them, where healthcare cannot reach them.
The Northern Territory, despite its mining wealth, contains some of Australia's poorest communities. Remote Aboriginal settlements face overcrowding rates exceeding 50 percent. Homes lack adequate cooling, reliable electricity, and consistent running water, even as temperatures regularly exceed 40 degrees Celsius. A territorial government warning in 2020 identified a need for 12,000 additional homes by 2025. Under a 2024 agreement between the federal Labor government and the Territory's administration, fewer than 300 new public homes are planned per year for the next decade. The housing crisis has created ideal conditions for a respiratory disease to spread.
Vaccination rates have collapsed since the COVID-19 pandemic. Public health experts agree that 95 percent coverage is needed to stop sustained transmission. In the Territory, vaccination rates have fallen below that threshold in several age groups. Among adolescents aged 13 to 18, only 67 percent are adequately vaccinated. Among adults, the figure drops to 30 percent. Immunity from childhood vaccination weakens over time and requires booster shots that people in remote communities increasingly miss. The current outbreak has struck adults aged 25 to 44 with unusual severity—a pattern that reflects not just low vaccination rates but also the healthcare system's failure to reach people with reminders and boosters.
The healthcare system itself is in crisis. The Territory faces chronic workforce shortages made worse by the pandemic. A 2024 analysis estimated the Territory would need to expand its healthcare workforce by more than 20 percent just to meet existing demand. In rural communities, the shortfall is catastrophic. Clinics cannot operate or can only offer limited services. Medicare funding freezes have forced GP clinics to close throughout the Territory, leaving rural towns dependent on one or two remaining practices. Nurse turnover in remote towns reaches 148 percent annually—people burn out and leave faster than they can be replaced. There is only one laboratory in the entire Territory to test for diphtheria, with results taking up to a week. Early signs of illness go unnoticed. Life expectancy in rural Aboriginal communities sits 13 years below the national average.
When cases began appearing in October, authorities did not sound an alarm. Dr. John Boffa, chief medical officer of the Central Australian Aboriginal Congress, told the Guardian that health services were not adequately informed about the outbreak's scale until months had passed. When his organization began going out to town camps to vaccinate people, they discovered the community had received almost no information about diphtheria itself—what it was, how serious it was, why vaccination mattered. It took nearly two months for sufficient vaccine supplies to arrive. By then, 15 to 20 new cases were being diagnosed each week. Eugene Penhall, a resident of Yuendumu, a remote community of 700 people, said plainly: "The thing about this outbreak is that we've never been told what it is." He described the reality of his community—ten people in one house, any of them potentially carrying the disease, no one knowing.
Leaked internal government statistics revealed that the NT Health department was aware of accelerating spread one month before issuing a public health alert in late March. The NT government has since refused to release detailed case breakdowns. The federal Labor government, certainly aware of the situation months earlier, took no emergency action. Only after sustained criticism from health workers and community organizations did the federal government announce $7.2 million in additional funding at the end of May—directed almost entirely toward vaccination programs and emergency staffing. No money went toward expanding testing capacity, strengthening the healthcare system, or building the housing that would actually stop the disease from spreading.
Diphtheria had been nearly eliminated from Australia for decades. Vaccination introduced in 1932 made the disease rare. Between 1999 and 2019, only eight cases of respiratory diphtheria were reported nationally. The current outbreak is the largest since national reporting began in 1991. It is not a mystery why it has returned. It is the result of deliberate choices—decades of underfunding public health, allowing housing to decay, allowing healthcare to collapse in remote areas, and then, when the disease emerged, suppressing information and delaying response. The outbreak continues to spread.
Notable Quotes
Health services were not adequately informed about the extent of the outbreak until months after cases had begun appearing in Darwin and remote communities, and community members received almost no information about the severity of diphtheria or the need for urgent vaccinations.— Dr. John Boffa, chief medical officer of the Central Australian Aboriginal Congress
The thing about this outbreak is that we've never been told what it is. How we live as Aboriginal people, we have 10 people in one house. They could be carrying this thing that we don't even know about and it's really, really bad.— Eugene Penhall, resident of Yuendumu, a remote Aboriginal community in the Northern Territory
The Hearth Conversation Another angle on the story
Why did diphtheria come back now, after being nearly eliminated for so long?
The disease never left—it just needed the right conditions. Vaccination rates fell below the threshold needed to stop transmission, but that's only part of it. The real driver is housing. When ten people live in one house, respiratory diseases spread fast. Add in a healthcare system that can't reach people, and you have an outbreak waiting to happen.
The government knew about this months before they told anyone. Why would they hide it?
That's the harder question. It wasn't necessarily malice—it was neglect dressed up as bureaucracy. Authorities weren't adequately informed themselves because the system is so fragmented. But once they knew, the delay in response suggests they didn't see it as urgent. Remote Aboriginal communities don't command the same resources or attention.
The funding they announced—$7.2 million—sounds substantial. Why is that not enough?
Because it only addresses vaccination. It doesn't build a single house. It doesn't hire permanent healthcare workers or expand testing capacity. It's treating the symptom while ignoring the disease. You can vaccinate people, but if they go home to overcrowded housing with no running water, you've only bought time.
Is there something about how diphtheria spreads that makes it particularly dangerous in these communities?
It travels through the air. In a crowded house, it moves from person to person. The respiratory form—the most dangerous kind—is what you see in outbreaks. And once someone gets sick, if the nearest clinic is hours away and the lab takes a week to confirm the diagnosis, the disease has already moved to the next person.
What would actually stop this outbreak?
Housing, first. Then healthcare workers who stay because they're not burned out. Then a public health system that can test quickly and communicate clearly with communities. The government could have done all of that. They chose not to.