Can a Tick Bite Cause a Meat Allergy?
Yes. In the United States, a bite from the Lone Star tick has been linked to alpha-gal syndrome (AGS), a delayed allergy to red (mammal) meat. This does not happen to everyone who is bitten, and the science is still growing. The best protection is to prevent tick bites in the first place.
Last reviewed
How the connection works
Researchers have linked certain tick bites to an immune response against alpha-gal, a sugar found in mammal meat. In the US, this is mainly true of the Lone Star tick. Once they become sensitized (allergic), some people react when they later eat red meat or other mammal products.
Key points to understand
- Most tick bites do not lead to a meat allergy.
- When reactions happen, they usually come several hours after eating.
- Repeated tick bites may increase or keep up sensitivity in people who have AGS.
- Avoiding tick bites is the most practical way to prevent it.
What to do if you're concerned
If you have reactions a few hours after eating red meat, keep a simple log of what you ate and your symptoms. Share it with a licensed doctor. A doctor decides on the diagnosis and any testing. For severe reactions like trouble breathing, call 911.
Common questions
Which tick causes meat allergy in the U.S.?
Mainly the Lone Star tick. It is the species most linked to alpha-gal syndrome in the United States, though research goes on.
How soon after a tick bite could a meat allergy appear?
It can take weeks to develop. Reactions to meat are also delayed, coming several hours after eating. A doctor can help you make sense of your situation.
Sources
- 1.Alpha-gal Syndrome (opens in a new tab) · CDC
What alpha-gal syndrome is, symptoms, and its association with tick bites.
- 2.Where Ticks Live (opens in a new tab) · CDC
The Lone Star tick is widely distributed in the Northeast, South, and Midwest U.S.
- 3.Diagnosis and Management of Patients with the α-Gal Syndrome (opens in a new tab) · Platts-Mills et al., J Allergy Clin Immunol Pract (2020)
Peer-reviewed clinical review of how alpha-gal syndrome presents, is diagnosed and is managed.
This guide is here to help you learn. It is not medical advice. If you have symptoms or questions, see a doctor. If someone has trouble breathing or a severe allergic reaction, call 911. Read our sources and disclaimer.