A four-year-old girl in Sri Lanka spent three months suffering from recurrent abdominal pain and vomiting before doctors uncovered a surprising culprit: an allergy to red meat triggered by tick bites. The case, reported in BMC Pediatrics by a team at the University of Kelaniya and Colombo North Teaching Hospital, is the first documented paediatric case of gastrointestinal-predominant alpha-gal syndrome associated with severe eosinophilia from Sri Lanka, and it carries a warning for clinicians far beyond the island’s borders.
Alpha-gal syndrome is an unusual allergy by almost any measure. Unlike classic food allergies, which are driven by proteins and strike within minutes of eating, alpha-gal syndrome is an IgE-mediated reaction to galactose-alpha-1,3-galactose, a sugar molecule found in the tissues of most non-primate mammals. Humans do not make this sugar, and when a tick transfers it from a mammal it has fed on into a human host, the immune system can respond by producing IgE antibodies against it. The result is a delayed allergic reaction, typically appearing three to six hours after a person eats beef, pork, lamb, or products derived from mammals such as gelatine or dairy.
The delay is precisely what makes the syndrome so easy to miss. Patients who break out in hives or collapse into anaphylaxis hours after dinner rarely connect the meal to the reaction, and emergency clinicians, seeing no immediate trigger, often look elsewhere. In the Sri Lankan girl’s case, the presentation was even more deceptive. Rather than the skin symptoms or full-blown anaphylaxis that dominate the classic picture, her illness was dominated by the digestive tract: months of abdominal pain and repeated vomiting of undigested food, with no obvious link to what she had eaten.
According to the case report, the girl was previously healthy and came from Western Province. Her three-month history of recurrent abdominal pain and vomiting of undigested food particles prompted a broad diagnostic workup. Blood tests revealed marked peripheral eosinophilia, with an eosinophil count of 8,506 cells per cubic millimetre, a level far above normal and one that typically pushes clinicians toward parasitic disease as the leading explanation, especially in a tropical setting where helminth infections remain common.
That suspicion was reasonable but ultimately wrong. Abdominal ultrasonography showed nothing remarkable, and serological testing for toxoplasmosis, toxocariasis, and filariasis, three parasitic infections that can drive eosinophil counts upward, all came back negative. Empirical anti-helminthic therapy, given on the assumption that a parasite might be hiding despite negative tests, failed to relieve her symptoms. Symptomatic treatment fared no better. The child continued to vomit and complain of pain while her blood work flagged an immune system in a state of allergic activation.
The diagnostic breakthrough came from two pieces of history that had initially been overlooked. The report describes a previous episode of delayed anaphylaxis occurring approximately three hours after she ate pork, a timing pattern that is a hallmark of alpha-gal syndrome. She also had a documented history of multiple tick bites, the established route of sensitisation to galactose-alpha-1,3-galactose. Taken together, these clues redirected the team toward the emerging diagnosis.
Confirmatory testing followed. Skin prick testing demonstrated positive reactions to fresh raw beef, fresh raw pork, gelatine, and cow’s milk, a pattern consistent with sensitisation to the alpha-gal sugar, which is present in all mammalian-derived foods and in gelatine. More definitively, a blood test for alpha-gal-specific IgE came back strongly positive at 29 kUA/L. With the clinical history, the tick exposure, the delayed reaction to pork, the food test results, and the specific antibody level all aligned, the team diagnosed gastrointestinal-predominant alpha-gal syndrome.
The treatment was deceptively simple: complete elimination of foods containing the alpha-gal sugar. Within one month of the elimination diet, the girl’s gastrointestinal symptoms resolved completely and her eosinophil count normalised. The resolution of both the symptoms and the severe eosinophilia after mammalian products were removed from the diet provided powerful confirmation that the allergy, not an undetected parasite or other inflammatory condition, had been driving her illness for months.
The case matters for several reasons. First, it demonstrates that alpha-gal syndrome in children can present almost entirely within the gastrointestinal tract, a phenotype the report’s authors describe as under-recognised. Children with chronic unexplained abdominal pain and vomiting are usually investigated for celiac disease, inflammatory bowel disease, infections, or functional disorders, and allergy testing is often limited to immediate-type food allergies. A delayed meat allergy driven by a sugar rather than a protein sits well outside most standard paediatric differential diagnoses, which is why the syndrome frequently goes undiagnosed for months or years.
Second, the severe eosinophilia adds an important twist. In tropical paediatrics, a count above 8,000 eosinophils per cubic millimetre almost reflexively triggers a parasitic workup, and the Sri Lankan team followed exactly that path before the allergy emerged as the answer. The authors suggest that gastrointestinal-predominant alpha-gal syndrome should be considered an important differential diagnosis in children presenting with unexplained chronic gastrointestinal symptoms, even when eosinophilia points initially toward parasites. The fact that anti-helminthic therapy failed and dietary elimination succeeded is a lesson in the value of revisiting the clinical history, including the seemingly incidental detail of tick bites and a delayed reaction hours after a pork meal.
Third, the report expands the known geography of the syndrome. Alpha-gal allergy was first characterised in the southeastern United States, where the lone star tick spreads sensitisation, but cases have since been reported across Europe, Australia, Asia, and Central and South America, implicating a range of tick species. Reports from South Asia, and paediatric reports in particular, have remained scarce. Documenting a confirmed case in a Sri Lankan child signals to regional clinicians that the syndrome is not confined to North America or Europe and that tick-borne sensitisation deserves a place in the diagnostic thinking of any physician caring for children in tick-endemic areas.
The underlying immunology continues to intrigue researchers. Galactose-alpha-1,3-galactose is produced by an enzyme that humans lost during evolution, which is why the sugar is foreign to us yet abundant in the meat, organs, and dairy of cows, pigs, and sheep. Why some tick-bitten people develop IgE against the sugar while most do not, and why reactions are delayed by hours rather than occurring within minutes as with protein allergens, remains an active area of study. One leading explanation for the delay is that the sugar must be released from fat and protein carriers during digestion before it enters the bloodstream and can cross-link IgE on immune cells, a slower process than the immediate absorption of soluble protein allergens.
For families, the practical implications of a diagnosis are significant but manageable. Avoiding mammalian meat is the core intervention, and many patients must also avoid gelatine and, in some cases, dairy, as this child’s positive skin test to cow’s milk illustrates. Careful reading of food labels, awareness of mammalian-derived ingredients in medications and medical products such as gelatine-stabilised vaccines or certain biologic drugs, and carrying emergency treatment for accidental exposures all become part of daily life. In some patients, alpha-gal IgE levels decline over years if tick bites are avoided, and tolerance can partially return, though continued tick exposure can re-sensitise.
What makes this Sri Lankan case resonate beyond its clinical details is the story it tells about modern medicine’s blind spots. A child with a treatable allergy spent three months undergoing parasite testing and empirical deworming because her symptoms did not match the textbook picture of food allergy. The clues were there all along, embedded in a history of tick bites and a delayed reaction to pork, but they only became visible once clinicians knew to look for them. As tick populations shift and expand with changing climates and land use, and as alpha-gal syndrome continues to emerge in new regions and new populations, the report’s central message grows more urgent: chronic unexplained gastrointestinal symptoms in a child, even with striking eosinophilia, should prompt clinicians to ask about ticks, red meat, and the hours in between.
Subject of Research: Gastrointestinal-predominant alpha-gal syndrome with severe eosinophilia in a child in Sri Lanka
Article Title: Gastrointestinal-predominant alpha-gal syndrome with severe eosinophilia in a child: a case report from Sri Lanka
Article References: Suriapperuma, T., Badanasinghe, N., Dineshika, G., Millavithana, V., Vipulanayake, T., & Mettananda, S. (2026). Gastrointestinal-predominant alpha-gal syndrome with severe eosinophilia in a child: a case report from Sri Lanka. BMC Pediatrics. https://doi.org/10.1186/s12887-026-07798-z
Image Credits: AI Generated
DOI: 10.1186/s12887-026-07798-z
Keywords: alpha-gal syndrome, tick bites, food allergy, eosinophilia, pediatrics, Sri Lanka, galactose-alpha-1,3-galactose, IgE, gastrointestinal symptoms, mammalian meat allergy, case report, elimination diet
News Source: Ophelia Keating. (October 8, 2026). Tick-Bite Meat Allergy Masquerading as Chronic Stomach Pain in a Four-Year-Old. Scienmag.
