How a misinterpretation of a BMJ publication from 1996 caused (and yes, I do mean caused) the explosion in rates of peanut allergy.
In a nutshell: for decades the guidance issued in the USA and UK was the opposite of what it should have been and left a generation with preventable, life-threatening allergies.
https://news.harvard.edu/gazette/story/2024/10/excerpt-from-blind-spots-by-marty-makary/