Jeremy Webb, a 15-year-old from Sydney, died in June 2022 after consuming a beef sausage while on a camping trip with friends. He experienced an asthma attack that triggered fatal anaphylaxis caused by tick-induced mammalian meat allergy (MMA), also known as alpha-gal syndrome. A coroner’s inquest determined in February that the allergic reaction, rather than asthma alone, was the cause of death. This marked the first confirmed fatality globally attributed to MMA.
MMA cases have risen steadily since 2007, when an Australian doctor discovered the connection between the allergy and tick bites. The condition develops when people are bitten by ticks carrying alpha-gal, a sugar molecule found in tick saliva. According to research, after two tick bites, approximately 50% of people develop antibodies to alpha-gal, and those with antibodies face a 15 to 20% chance of developing a meat allergy. Australia’s east coast, particularly areas north of Sydney, represents one of two global hotspots for MMA, with some regions reporting more than 700 sufferers per 100,000 people. Cases have increased by 22% annually since 2020, with scientists estimating more than 5,000 suspected cases in Australia.
Symptoms vary widely and can range from mild skin rashes and stomach cramps to severe anaphylaxis. The condition proves particularly challenging to diagnose because symptoms often develop hours after eating, symptoms may not occur consistently, and reactions can be influenced by factors including meat type, preparation method, alcohol consumption, and exercise. Additionally, hypersensitive individuals may react to mammalian products beyond meat, such as milk derivatives, certain beauty products, and even fumes from barbecues or contact with pets.
The impact on patients extends beyond physical symptoms to daily functioning. Affected individuals report difficulty maintaining employment, attending social gatherings centered around food, and managing constant vigilance about potential triggers. Mental health challenges, including eating disorders and psychological distress from diagnostic uncertainty, have also been documented among patients.
A significant concern identified by researchers is that approximately 85% of people with MMA are unaware they have the condition. These individuals carry antibodies but have not experienced allergic reactions to meat, yet remain at risk of unexpected severe reactions to certain medications and medical treatments containing animal-derived ingredients. Jeremy’s mother has become an advocate for raising awareness and improving treatment protocols to prevent similar tragedies.
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