Exporting vaccine skepticism

Upwards of 150 million lives have been saved by global vaccination drives since the mid-1970s. But now, vaccine rates are stalling and, in some places, they're in decline. Professor Peter Hotez, co-director of the Texas Children's Hospital Center for Vaccine Development says that's in part due to the export from the US of anti-vaccine hesitancy. Dr. Hotez speaks with The World's Host Carolyn Beeler about how and why the US anti-vaccine movement has gone global.