Shelby Lum. David Ayares, president and chief scientific officer of Revivicor, holds a package of frozen meat during an interview at the company’s offices in Blacksburg, Va., on May 30, 2024.

BLACKSBURG, Va. — Some people who develop a weird and terrifying allergy to red meat after a bite from a lone star tick can still eat pork from a surprising source: Genetically modified pigs ...