... por mordedura de carrapatos?
http://www.dailymail.co.uk/health/article-4630654/Lone-Star-ticks-cause-people-allergic-meat.html
Citando:
"The bite causes an allergy to a sugar molecule that's found in red meat, called alpha-galactose, or 'alpha-gal', according to Business Insider.
Dr. Ronald Saff, of Florida State University, said to the news outlet: 'The weird thing about [this reaction] is it can occur within three to 10 or 12 hours, so patients have no idea what prompted their allergic reactions.'
Victims may have to dramatically alter their diets after the bite because there is no known cure for the alpha-gal allergy."