Longevity & AgingAlpha-Gal Syndrome Decoded: How Tick Bites Trigger Delayed Meat Anaphylaxis
Alpha-gal syndrome (AGS) is a tick-induced allergy causing delayed anaphylaxis to mammalian meat, discovered through investigation of severe reactions to the cancer drug Cetuximab. IgE antibodies targeting the oligosaccharide galactose-alpha-1,3-galactose (alpha-gal) are sensitized by lone star tick (Amblyomma americanum) bites in the USA. Unlike typical food allergies, reactions occur 3–5 hours after eating red meat. All humans naturally produce IgM, IgG, and IgA to alpha-gal, but only tick-bitten individuals develop IgE. Management requires mammalian meat avoidance, and IgE levels only decline with strict tick bite prevention. The syndrome is now recognized globally, with different tick species involved in different regions.
