06/18/2026
https://centrumpharmacy.com/alpha-gal-syndrome/
There is a tick that can make you allergic to red meat. It's called the lone star tick, and the condition it causes ā alpha-gal syndrome ā is expanding its range into Canada.
Alpha-gal syndrome develops after a lone star tick bite sensitizes the immune system to a sugar molecule found in mammalian flesh. After that, eating beef, pork, lamb, or other red meat triggers an allergic reaction. The reaction is delayed ā appearing two to six hours after eating ā which is why most people don't immediately connect the two and why the condition is frequently missed.
The lone star tick is not established in Ontario but has been detected here. The risk is currently low and rising, particularly for people who travel to the United States.
A few things worth knowing:
The bite itself often goes unnoticed. Check thoroughly after any time outdoors in wooded areas, especially after travel to endemic US regions.
The delayed reaction pattern is unusual for a food allergy. If you're having unexplained allergic reactions hours after eating red meat, alpha-gal should be on the list.
In Ontario, tick bites can be assessed at Centrum Pharmacy under the Minor Ailment Program ā no doctor's appointment needed.
If you've been bitten recently and want to know what to watch for, come in and talk to us.
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