Tick bites spark a life-threatening meat allergy: alpha-gal syndrome

Alpha-gal syndrome is a potentially life‑threatening meat allergy triggered by lone star tick bites, causing delayed reactions after eating mammal meats while seafood and poultry are safe. About 450,000 Americans are affected as the lone star tick’s range expands. The allergy results from antibodies to the alpha-gal sugar introduced by bites; diagnosis combines symptoms with a blood test, though tests can yield false positives. Management typically involves avoiding mammal meats (and sometimes dairy) and carrying an epinephrine injector. In 2024 the FDA approved Xolair to reduce severe reactions, with ongoing research into additional therapies; some patients may outgrow the condition after years, but avoiding new tick bites remains crucial.