As of last fall, more than 45,000 Texas students have received nonmedical exemptions for their school vaccinations. That makes the state a prime location for an outbreak of measles – one of the most contagious and lethal of all diseases. That’s according to Dr. Peter J. Hotez, a pediatrician at Baylor College of Medicine and director of the Texas Children’s Hospital Center for Vaccine Development. He joins us to talk about how the anti-vaccination movement is gaining ground nationwide, which he wrote about recently in The New York Times.