The Return of a Forgotten Killer: Why Diphtheria’s Comeback Should Alarm Us All
There’s something deeply unsettling about a disease from the history books making a comeback. Diphtheria, a once-feared killer, is resurfacing in Australia, and it’s not just a medical anomaly—it’s a wake-up call. Personally, I think this resurgence is a stark reminder of how fragile our progress against infectious diseases really is. What makes this particularly fascinating is how quickly we’ve forgotten the horrors of diphtheria, thanks to the success of vaccines. But now, with outbreaks in the Northern Territory, Western Australia, and beyond, it’s clear that complacency has consequences.
The Disease We Thought We’d Conquered
Diphtheria was once a leading cause of childhood death globally. In Australia alone, over 4,000 people died from it between 1926 and 1935. Fast forward to today, and the numbers are shocking: 17 cases of respiratory diphtheria in the NT in just one month, and 27 cases in the Kimberley region of WA. What many people don’t realize is that respiratory diphtheria is no minor illness—it can suffocate you by forming a greyish-white membrane in your throat, blocking your airway. Even with treatment, up to 10% of cases are fatal.
From my perspective, this isn’t just a health crisis; it’s a failure of memory. We’ve grown so accustomed to living without diphtheria that we’ve stopped prioritizing the very thing that keeps it at bay: vaccination.
The Vaccine Gap: A Perfect Storm of Neglect
Vaccination rates in Australia have been slipping since the COVID-19 pandemic. Among two-year-olds, coverage dropped from 92.1% in 2020 to 88.4% in 2025. In the NT, only 91.9% of five-year-olds are fully vaccinated against diphtheria—the lowest rate in the country. What this really suggests is that even small declines in vaccination can create pockets of vulnerability, allowing diseases like diphtheria to take hold.
One thing that immediately stands out is the disparity in vaccine coverage among Aboriginal and Torres Strait Islander children in the NT, where rates are actually higher at 95.35%. This raises a deeper question: Why are some communities more protected than others? Is it access, trust, or something else entirely?
The Human Cost of Hesitancy
Vaccine hesitancy is often framed as a personal choice, but its consequences are anything but. In 2022, an unvaccinated toddler in New South Wales became Australia’s first respiratory diphtheria case in three decades. This wasn’t just a statistic—it was a child fighting for breath in intensive care. If you take a step back and think about it, this is the human cost of declining vaccination rates.
What’s troubling is that hesitancy isn’t just about misinformation; it’s about trust. Parents report feeling rushed during consultations and unsure about the information they’re given. In my opinion, this is where the healthcare system is failing. We need longer, more empathetic conversations about vaccines, not just quick jabs and goodbye.
The Antitoxin Shortage: A Looming Crisis
Here’s a detail that I find especially interesting: even if you catch diphtheria, the antitoxin needed to neutralize the toxin isn’t readily available. Global production has declined due to low demand, leaving us with limited stockpiles. This is a classic case of success breeding complacency. We stopped making the antitoxin because we stopped needing it—until now.
This shortage highlights a broader issue: our preparedness for diseases we thought were gone. If diphtheria continues to spread, we’ll be scrambling to produce a treatment that should have been readily available.
What’s Next? A Call to Action
Reversing this trend won’t be easy. It requires addressing practical barriers to vaccination, like access and cost, as well as rebuilding trust in healthcare providers. Personally, I think we need a two-pronged approach: invest in primary care to make appointments more accessible and fund training for providers to have meaningful conversations about vaccines.
But it’s not just on the healthcare system. We all have a role to play. Check your vaccination records. Get your booster if needed. And if you’re a parent, ask questions—don’t let uncertainty linger.
Final Thoughts: A Disease of the Past or a Warning for the Future?
Diphtheria’s return is more than a medical curiosity; it’s a mirror reflecting our priorities. We’ve spent decades eradicating diseases, only to let our guard down when they’re no longer a threat. What this really suggests is that public health is a constant battle, not a one-time victory.
In my opinion, diphtheria’s comeback is a warning—not just about this disease, but about all the others we’ve pushed to the brink. If we don’t act now, we risk undoing decades of progress. And that’s a future none of us can afford.
