Bloomberg reports that US measles cases have topped 5,000 for the first time since 1991, with 5,182 CDC-confirmed infections across 45 states as falling vaccination rates erode herd immunity, and that the US likely faces losing its measles-elimination status, which the Pan American Health Organization will review in the week after November 6, 2026. Pennsylvania has been hardest-hit with 1,467 cases, and a dispute over its six reported measles deaths has pitted Health Secretary Robert F. Kennedy Jr., who has questioned the deaths and touted unproven remedies, against Governor Josh Shapiro.