Tick-induced illness surges in Sydney’s north, Central Coast

The Invisible Threat: The Rise of Alpha-gal Syndrome

For decades, food allergies were primarily associated with nuts, shellfish, or dairy. However, a complex and often overlooked condition known as Mammalian Meat Allergy (MMA)—or Alpha-gal Syndrome—is emerging as a significant public health challenge. Unlike traditional allergies, MMA is not something people are born with; This proves acquired through the environment.

The trigger is a bite from specific ticks, such as the Eastern Paralysis tick. When these parasites feed, they inject saliva containing a carbohydrate called alpha-galactose. In many cases, this causes the immune system to produce antibodies to fight the foreign molecule. According to Professor Sheryl Van Nunen, an immunologist and allergy physician, after two tick bites, 50 per cent of people will make allergy antibodies to the alpha-gal molecule.

This biological shift creates a dangerous paradox: a common outdoor activity, like hiking or camping, can fundamentally rewrite a person’s immune system, making red meat, pork, and other mammalian products potentially lethal.

The Danger of the ‘Asthma Mask’: Why Misdiagnosis is Rising

One of the most harrowing aspects of MMA is its ability to mimic other conditions. Because the allergic reaction often occurs several hours after eating—unlike the immediate reaction seen with peanut allergies—it is frequently misidentified as asthma or general malaise.

The tragic case of 16-year-old Jeremy Webb highlights this medical gap. Webb, who suffered from asthma since childhood, experienced nighttime breathing difficulties that his family believed were asthma attacks. However, a later inquest by the NSW Deputy Coroner concluded his death was actually caused by anaphylaxis due to MMA. His father, Jonathan Webb, noted that during these episodes, we were giving him his Ventolin and he said, ‘It’s not working’.

As the prevalence of tick-borne illnesses grows, the medical community faces a critical need for better differential diagnosis. When a patient presents with “nocturnal asthma” or unexplained respiratory distress, a history of tick bites may soon become a mandatory screening question in emergency rooms and GP clinics.

Future Trends: Environmental Shifts and Tick Migration

Experts warn that we are seeing the beginning of a broader geographic shift. Regions once considered safe are becoming hotspots. In Australia, Sydney’s northern beaches and the Central Coast have emerged as global epicenters for the disease.

Data from the CSIRO indicates a concerning upward trajectory. Study lead Dr Alex Gofton reports that there’s over 5000 people living with this condition and that since 2020, case numbers have increased 22 per cent year-on-year.

Looking ahead, several factors are likely to influence the spread of Alpha-gal Syndrome:

• Climate Change: Shifting weather patterns and warming temperatures are expanding the habitats of tick populations, pushing them into new urban and suburban fringes.
• Increased Outdoor Recreation: As more people engage in “bush-bashing” and coastal camping, the frequency of human-tick interactions is rising.
• Improved Diagnostics: As awareness grows, more people who previously suffered from “unexplained” allergies will be correctly diagnosed, likely causing a spike in reported statistics.

The Evolution of Public Health Awareness

The current approach to tick safety is often passive, but advocates are calling for a more aggressive strategy. There is a growing movement to implement public health campaigns similar to the Slip, Slop, Slap sun safety initiative, specifically targeting the dangers of tick bites.

Future healthcare trends will likely move toward “Precision Prevention,” where residents in known hotspots receive targeted alerts via health apps when tick activity is high. The integration of MMA screening into standard allergy panels will be essential to prevent the kind of missed opportunities seen in the Webb case, where hospital admissions for anaphylaxis were overlooked.

“I know more people have died from this. People who’ve been categorised as their mode of death being asthma where it’s actually been food allergy.” Professor Sheryl Van Nunen, Immunologist

Frequently Asked Questions