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New CDC Study Reveals Broader Risk of Tick-Borne Meat Allergy in Several States
A recent study by the Centers for Disease Control and Prevention (CDC) indicates that a larger portion of the population in certain U.S. states may be at risk for alpha-gal syndrome-a tick-borne condition that causes an allergy to red meat-than previously recognized.
Alpha-gal syndrome is primarily linked to bites from the lone star tick, which can carry a sugar molecule called alpha-gal after feeding on mammals such as cows, deer, goats, and pigs. When these ticks bite humans, they may transmit alpha-gal, potentially triggering allergic reactions to red meat and related products like gelatin.
The CDC’s analysis examined blood samples from approximately 3,000 adults across 10 states collected between November 2024 and April 2025. Results showed that nearly 24% of adults in five states with high lone star tick populations-Arkansas, Kentucky, Missouri, Tennessee, and Virginia-had antibodies indicating prior exposure to alpha-gal.
However, the presence of these antibodies does not necessarily mean individuals have alpha-gal syndrome or require testing, explained Dr. Eleanor Saunders, lead author of the study and infectious disease specialist at the University of North Carolina-Chapel Hill. “This finding primarily signals previous tick exposure, not a definitive diagnosis,” she emphasized, cautioning against overdiagnosis or unnecessary dietary restrictions.
While the CDC estimates that roughly 450,000 Americans may have alpha-gal syndrome, accurate prevalence remains unclear. Reporting of cases is inconsistent, with only a few states mandating physician reports, and the condition is not currently tracked in national disease surveillance systems alongside illnesses like Lyme disease or West Nile virus.
Sharon Forsyth, executive director of the Alpha-Gal Alliance Action Fund, expressed concern over the lack of comprehensive case tracking. “Alpha-gal is among the most common vector-borne diseases in the U.S., yet we have no clear numbers. That’s a serious gap in public health awareness,” she stated.
Experts also warn that alpha-gal syndrome may become more widespread geographically. Dr.
Scott Commins, an allergy immunology specialist and co-author of the study, noted increasing cases in regions such as Oklahoma and the Great Lakes. He attributed this trend to warmer winters and expanding deer habitats, which facilitate the spread of lone star ticks-and potentially other tick species like black-legged, Cayenne, and Asian longhorned ticks-that can also transmit alpha-gal.
Symptoms of alpha-gal syndrome can be challenging to identify as they often appear several hours after consuming red meat. Common signs include hives, gastrointestinal distress, respiratory difficulties, swelling, and in severe cases, anaphylaxis. Once diagnosed, the allergy is typically lifelong.
As research continues, public health officials urge awareness of this emerging tick-related health issue, especially in areas where lone star ticks are prevalent. Early recognition of symptoms and preventive measures to avoid tick bites remain key strategies in managing the risk of alpha-gal syndrome.