What is Alpha-Gal Syndrome?

Alpha-Gal Syndrome (AGS) is an allergic condition triggered by the bite of a Lone Star tick. It causes allergic reactions to galactose-alpha-1,3-galactose (alpha-gal), a sugar molecule found in most mammals. Symptoms typically appear 3-6 hours after eating red meat, pork, or lamb, and can range from hives to life-threatening anaphylaxis. According to the CDC, over 450,000 Americans may have developed AGS since 2010.

What foods should Alpha-Gal patients avoid?

Alpha-Gal patients must avoid all mammalian meat including beef, pork, lamb, venison, and bison. Many also react to mammalian by-products like gelatin (found in gummy vitamins and gel capsules), dairy products, and ingredients derived from mammals such as lard, tallow, and carrageenan. Safe alternatives include poultry (chicken, turkey, duck), fish, seafood, eggs, and all plant-based foods.

What medications are safe for Alpha-Gal Syndrome?

Many medications contain hidden mammalian ingredients. Gel capsules and softgels often contain bovine or porcine gelatin. Safe alternatives include tablets, caplets, liquids, and capsules made with vegetable-based HPMC. Always check inactive ingredients for gelatin, magnesium stearate (usually plant-derived in US), lactose, and stearic acid. VectorShield helps patients identify safe medication alternatives.

What are the 4 sensitivity levels of Alpha-Gal Syndrome?

Alpha-Gal sensitivity varies by patient: Level 1 (Mild, ~40%) - react only to mammalian meat; Level 2 (Moderate, ~30%) - also react to gelatin products; Level 3 (Significant, ~20%) - also react to dairy products; Level 4 (Severe, ~10%) - react to trace amounts and cross-contamination, sometimes called 'super reactors'. Sensitivity can change over time, especially with additional tick bites.

Can Alpha-Gal Syndrome be cured?

There is currently no cure for Alpha-Gal Syndrome, but many patients see improvement over time if they avoid additional tick bites. Some patients report tolerance returning after 1-5 years of strict avoidance and no new tick exposures. However, a single new tick bite can restart or worsen the condition. Management focuses on strict avoidance of trigger foods and carrying emergency medication like epinephrine.

CDC Data 2017-2022

Alpha-Gal Syndrome prevalence map

Explore the geographic distribution of Alpha-Gal Syndrome cases across the United States. Over 110,000+ suspected cases were reported between 2017-2022.

High Risk (>20%)

Medium Risk (10-20%)

Low Risk (1-10%)

Minimal (<1%)

No Data

67 verified providers21 states covered5 offer telehealth

0 community reports0 states with reports

Reading the data

What this map shows

Highest prevalence

Arkansas (39%), Oklahoma (35%), and Missouri (29%) show the highest reported AGS prevalence, correlating closely with Lone Star tick populations.

Underdiagnosis

AGS is not a nationally notifiable condition. The CDC estimates actual cases may be 2-4x higher than reported, owing to limited awareness among healthcare providers.

Growing concern

Cases have risen as Lone Star tick populations expand northward. New cases are being reported in states that were previously unaffected.

References

Data sources

Military Study (2023)

Alpha-Gal IgE prevalence in 3,000 military recruits

CDC MMWR Report

Geographic distribution of suspected AGS cases

CDC Alpha-Gal Info

Official CDC information on Alpha-Gal Syndrome

Data disclaimer

Data compiled from published research studies. Alpha-Gal Syndrome is not a nationally notifiable condition in most states, so actual prevalence may be significantly higher due to underdiagnosis and underreporting. This map is for educational purposes only and is not a substitute for medical advice or diagnosis.

Think you might have Alpha-Gal?

Take our quick sensitivity quiz to understand your risk level, or use the app to check medications and foods for alpha-gal triggers.

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