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Allergy overviewRegional

What is alpha-gal syndrome?

Alpha-gal syndrome is a potentially serious allergy to a sugar molecule found in most mammals. It can develop after certain tick bites and may cause delayed reactions to red meat or other mammal-derived products.

Reviewed by VuxLore® Knowledge Team For Everyone

Short answer

Alpha-gal syndrome is a potentially serious allergy to a sugar molecule found in most mammals. It can develop after certain tick bites and may cause delayed reactions to red meat or other mammal-derived products.

At a glance

The ticks associated with alpha-gal syndrome differ by region, and diagnosis requires a clinical history and appropriate allergy testing.

Key takeaways

• Reactions can be delayed after exposure to food.

• Not every tick bite causes alpha-gal syndrome.

• Breathing difficulty or a severe reaction needs emergency care.

An unusual route to food allergy

Alpha-gal is present in most non-primate mammals. A tick bite can sensitise some people, after which meat, dairy, medicines or other mammal-derived materials may trigger reactions of varying severity.

Specialist guidance matters

Symptoms and tolerances differ between people. Diagnosis and avoidance planning should be led by an allergist or other qualified clinician, with emergency instructions for severe reactions.

Sources and further reading