Imagine this: You’re at your doctor’s office with a sore throat. The nurse asks, “Any allergies?” And without hesitation you reply, “Penicillin.” It’s something you’ve said for years – maybe since childhood, maybe because a parent told you so. The nurse nods, makes a note and moves on.
But here’s the kicker: There’s a good chance you’re not actually allergic to penicillin. About 10% to 20% of Americans...