Alpha gal is a delayed allergic reaction that occurs following the consumption of mammalian meat or exposure to other animal-based foods and products. Reactions are typically delayed 2−6 hours but can range from minutes to 12−24 hours. Incidence is increasing. It occurs in children.

Young I et al. Tick exposures and alpha-gal syndrome: A systematic review of the evidence. Ticks and Tick-borne Diseases Volume 12, Issue 3, May 2021, 101674.