Vaccine hesitancy fueled by misinformation is causing new surges of measles and whooping cough, alongside ongoing COVID-19 hotspots and an Ebola outbreak in central Africa.
There have been 1,983 measles cases nationally this year, nearing the 2,288 cases reported for all of 2025, which was the worst year since 1991, according to the Centers for Disease Control and Prevention.
Twelve states and the District of Columbia have already recorded more measles cases halfway through the year than they had in all of 2025.
South Carolina had the highest number of cases at 669 this year and declared an end in April to the largest measles outbreak in the nation in 35 years.