Tick Bites Can Lead to Red Meat Allergy.
Position | DIAGNOSTICS |
While rare, some people experience recurrent episodes of anaphylaxis--a life-threatening allergic reaction that causes symptoms such as constriction of airways and a dangerous drop in blood pressure--for which the triggers never are identified. Researchers at the National Institute of Allergy and Infectious Diseases have found that some patients' seemingly inexplicable anaphylaxis actually is caused by an uncommon allergy to a molecule found naturally in red meat They note that the allergy which is linked to a history of a specific type of tick bite, may be difficult for patients and health-care teams to identify.
As the researchers describe in their article published in Allergy, six of 70 study participants evaluated for unexplained frequent anaphylaxis tested positive for an allergy to galactose, or alpha-gal, a sugar molecule found in beef, pork, lamb, and other red meats. The six adult male participants all had IgE antibodies--immune proteins associated with allergy--to alpha-gal in their blood. After implementing diets free of red meat, none of them experienced anaphylaxis in the 18 months to three years during which they were followed.
While the prevalence of allergy to alpha-gal, or "alpha-gal syndrome" is not known, researchers have observed that it occurs mostly in...
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