Australia is facing its largest whooping cough outbreak in more than three decades, with medical leaders sounding an urgent alarm: vaccination is the only reliable shield. Whooping cough, or pertussis, is not a new disease, but it is making a dramatic comeback. In 2024, more than 57,000 cases were reported across Australia the highest number since 1991. And the wave has not slowed. In South Australia, early 2025 data show over 1,000 infections — more than ten times higher than the same period last year.The national disease surveillance dashboard reports nearly 19,000 cases already in 2025, with hotspots including Queensland, South Australia, and Western Australia’s Kimberley region. Doctors say this is now Australia’s most significant and long-lasting pertussis outbreak in decades.Pertussis is caused by the bacterium Bordetella pertussis. It spreads easily through coughs and sneezes, thriving in close-contact settings such as households and schools. For most adults, it causes weeks of relentless coughing that disrupts sleep, work, and quality of life. But for infants — especially those too young to be vaccinated it can be life-threatening.Newborns can develop severe respiratory distress, pneumonia, and even brain damage from prolonged oxygen deprivation during coughing fits. Globally, the World Health Organization estimates that pertussis kills tens of thousands of children every year, most of them under six months old.AMA’s Urgent CallThe Australian Medical Association (AMA) has issued a clear warning: complacency is dangerous. AMA President Dr. Danielle McMullen described the outbreak as “extremely concerning,” citing both the sheer scale of cases and the drop in vaccination coverage.“We can’t afford to be complacent,” Dr. McMullen said. “Each year, thousands of lives are lost to respiratory diseases like whooping cough — and we all have a role to play in preventing their spread. Vaccination remains our most powerful defence.”Why Pregnancy Vaccination is Crucial?One of the AMA’s strongest messages is directed at expectant mothers. A pertussis-containing vaccine is recommended during every pregnancy, ideally between 20 and 32 weeks. This approach allows protective antibodies to pass from mother to baby through the placenta, shielding the newborn during the critical first weeks of life.“Maternal vaccination creates antibodies which are passed to the unborn baby and protect them in their first days and weeks of life,” Dr. McMullen explained. “But it doesn’t stop there — ensuring family members and other caregivers are also vaccinated helps create a protective cocoon around infants.”This cocooning strategy reduces the risk that parents, grandparents, siblings, or caregivers will transmit the infection to newborns who are too young to complete their first immunization schedule.Vaccines Are Free and AccessibleIn Australia, whooping cough vaccines are free for all pregnant women under the National Immunisation Program. Parents are also encouraged to keep their children’s vaccines up to date, particularly during the first six months, when infants are most vulnerable.For adults, boosters are recommended every 10 years, especially for anyone living with or caring for babies. General practitioners and pharmacies can check vaccination records and provide catch-up doses when needed.Falling Vaccination Rates and Rising CasesPart of what makes this outbreak alarming is its timing. Australia has not met its childhood vaccination targets in several regions, and vaccine hesitancy has crept upward in recent years. This leaves pockets of communities vulnerable, creating fertile ground for pertussis to spread.The AMA warns that failing to address this could undo decades of progress in reducing serious childhood diseases. “Getting vaccinated is one of the simplest and most effective ways you can protect your loved ones and your community,” Dr. McMullen said.Learning From HistoryAustralia has seen waves of whooping cough before. The last major epidemic peaked in 2011 with over 38,000 cases. But today’s surge is different in scale, surpassing even that crisis and persisting longer. Globally, other countries have also seen cyclical rises in pertussis, underscoring that this is not just an Australian problem.The key difference between a contained outbreak and a devastating one is vaccination coverage. Experts point to herd immunity thresholds: when enough people are vaccinated, the chain of transmission breaks, protecting those who cannot be immunized.Though the latest figures come from Australia, health experts stress that this is a global concern. Travel and migration mean outbreaks do not remain confined to national borders. Declining vaccination rates in parts of the United States and Europe could set the stage for similar resurgences.For families worldwide, the lessons are clear: stay up to date on vaccinations, encourage maternal immunization, and understand that diseases once considered “childhood illnesses of the past” can and do return if immunity gaps open.Australia’s pertussis outbreak is a wake-up call for all of us. With more than 57,000 cases in a single year and rates still climbing, whooping cough has proven it can resurge when vaccination rates slip.The AMA’s message is urgent but simple: act now. Pregnant women, parents, and caregivers should prioritize immunization to protect both themselves and those too young to be vaccinated. Free vaccines are available, and the science is clear immunization saves lives. As Dr. McMullen put it, “We must not lose sight of the fact that immunisation saves lives.”