How does a vegetarian become allergic to red meat?

By being bitten by a forest tic who injects alpha-gal during a bite to which IgE antibodies are made, As well as being present in red meat, alpha-gal is present in some drugs derived from mammalian tissue or cells such as gelatin-based colloids.

References

	Fischer J, Lupberger E, Hebsaker J, Blumenstock G, Aichinger E, Yazdi AS, Reick D, Oehme R, Biedermann T, Prevalence of type I sensitization to alpha-gal in forest service employees and hunters, Allergy, 2017;72:1540-1547,10.1111/all.13156

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