The lone star tick bite can cause an allergy to red meat, as well as to dairy and some medications and some doctors haven’t even heard of it.

The bite of the lone star tick, found in the U.S. South, Midwest, and mid-Atlantic, can trigger a bizarre and sometimes dangerous allergy in humans to red meat (such as beef, pork, and venison), dairy, gelatin, and some medications. Known as alpha-gal syndrome, the condition is caused by an immune reaction to the sugar alpha-gal (galactose-α-1,3-galactose), which is found in the flesh of most nonprimate mammals. Patients with the syndrome can still eat chicken or fish to get protein. Suffolk County, on Long Island, New York, currently leads the nation with nearly 4,000 confirmed cases of alpha-gal syndrome.
If people with the syndrome consume animals or products with alpha-gal sugar, they can suffer reactions ranging from diarrhea to hives to anaphylactic shock. There is no treatment, and many patients are forced to radically alter their diet for years, or for life.

 

Much more info at the link:
https://www.scientificamerican.com/article/red-meat-allergy-caused-by-tick-bite-is-spreading-and-nearly-half-of-doctors-dont-know-about-it/