How major media outlets screwed up the vaccine ‘breakthrough’ story

Late Thursday, the Washington Post landed what looked like a big scoop: the paper obtained an unpublished slide presentation from inside the Centers for Disease Control and Prevention suggesting that the Delta variant of the coronavirus spreads as easily as chickenpox, and that fully vaccinated people who become infected with the variant may be able to pass it on in a way similar to unvaccinated people who become infected. (The slides were based in part on data about a COVID outbreak linked...