Current public-health messaging on Covid breakthrough cases may understate the scale and risk
David Wallace-Wells writes: The term itself, perhaps, is a problem. “Breakthrough” sounds bad — implying an immune-escape mutation, likely rare, and therefore alarming. The vaccines were never tested to prevent transmission, only symptomatic disease, and those who knew the science expected, from the outset, that we would see some number of such cases, and that they would be, overwhelmingly, mild. But Delta appears to have changed things. Not everything: The vaccines are working to suppress severe outcomes from COVID infection…