Al Jazeera reports that the CDC has recorded 5,182 confirmed US measles cases in 2026, the highest since 1991 and more than double 2025's total, with children and teens accounting for about 59 percent and Pennsylvania reporting 1,487 cases. The federal death count of four sits at the centre of a dispute between Governor Josh Shapiro and Health Secretary Robert F Kennedy Jr, after the CDC removed Pennsylvania's two August deaths when Kennedy, a vaccine sceptic, questioned whether measles caused them.