Unusual Meat Allergy From Tick Bites Spreads Across the U.S.
Getty Images/Ladislav Kubeš
A little-known allergy linked to tick bites is becoming far more common, and medical experts now believe it has contributed to several deaths. Reports indicate that alpha-gal syndrome, once considered rare, is spreading rapidly across parts of the United States.
The condition is triggered by bites from the lone star tick. When the tick bites a person, its saliva introduces a sugar molecule known as alpha-gal into the bloodstream. This molecule can cause the immune system to react strongly. After that exposure, the person’s body may treat alpha-gal as a threat. Because the same sugar molecule exists in the meat and tissues of many mammals, eating foods such as beef or pork later on can trigger an allergic reaction.
Unlike many food allergies that cause immediate symptoms, reactions from alpha-gal syndrome often appear hours after eating. Medical experts say symptoms usually begin between two and six hours after consuming meat or other mammal-based products. People with the condition can develop hives, itching, swelling of the face, breathing problems, wheezing, nausea, vomiting, or diarrhea.
Doctors have also seen reactions tied to medications and medical materials that contain substances derived from animals. In some of the most serious incidents, people experienced severe allergic reactions after eating foods like hamburgers or beef tacos. There have also been cases linked to medical procedures, including heart surgery where animal-based materials were used.
While deaths tied to the syndrome remain rare, physicians say the risk is real in the most severe reactions.
Health officials believe the number of Americans affected is significant. The Centers for Disease Control and Prevention estimates that as many as 450,000 people in the United States may have developed alpha-gal syndrome between 2010 and 2022.
The condition appears most frequently in certain regions where the lone star tick is common. Areas stretching from Long Island through Virginia and into parts of Kentucky, Tennessee, and the Ozarks have reported large numbers of cases.
Recent studies suggest that many more people may carry antibodies linked to alpha-gal than previously thought. Researchers are now investigating whether the allergy may also be connected to other health issues, including digestive problems and heart disease. Scientists and doctors are still trying to determine how many cases may be going undiagnosed as the tick-driven allergy continues to spread.
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