Study Indicates High Potential for Tick-Linked Meat Allergy in US Population

A study published in the Morbidity and Mortality Weekly Report indicates that in some regions of the United States, up to 30 percent of individuals may carry the antibody associated with a red meat allergy linked to tick bites. This figure is significantly higher than the Centers for Disease Control and Prevention's previous estimate that only 0.14 percent of the US population, or up to 450,000 people, actually has the allergy. The study emphasizes the need for better understanding and diagnosis of this condition, which is caused by the IgE antibody that targets a sugar molecule known as galactose-α-1,3-galactose, or alpha-gal. This molecule is present in nonprimate mammals and is also found in the saliva of certain ticks, particularly the lone star tick (Amblyomma americanum). Individuals who are bitten by these ticks may develop IgE antibodies against alpha-gal, which can lead to allergic reactions when consuming red meat and other animal products.