A simple tick bite may be causing life-threatening allergies to beef and pork. One Missouri man found himself suffering anaphylaxis after eating a hot roast beef sandwich, reports Meryl Lin McKean for Fox4 Kansas City.

The tick causing the allergy is a Lone Star tick. “Somehow the immune system is activated and your body begins reacting to molecules in beef and pork and other meat from mammals," Dr. Larry Landwehr, an allergist in Warrensburg, Mo, told McKean.

So far, it's unclear whether the red meat allergy reacts to just one bite or multiple, and it takes three to six hours to occur after meat consumption. Dr. Landwehr reported that there have been a few times that the allergy has gone away.

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