Mexico has reported a surge in measles cases in the border state of Chihuahua following an outbreak of the highly contagious, vaccine-preventable disease in unvaccinated communities in Texas. Dr. Paul Offit, a Philadelphia pediatrician specializing in infectious diseases, says RFK Jr.'s anti-vaccine misinformation is to blame. The measles outbreak, Mexico's largest in decades, has spread beyond the Mennonite settlements, impacting neighboring Indigenous populations and raising concerns about international transmission, particularly given Chihuahua's location on the US border. While Mexico health officials acknowledge the progress made through collaboration with Mennonite leaders and report tens of thousands of new vaccinations, the infection rate continues to rise. There may be as many as 2,000 cases of measles in northern Mexico.