The US military no longer requires soldiers to get a flu shot. Measles — eliminated in America a generation ago — is back, with children dying. And the man in charge of national public health built his career questioning vaccine safety. For World Immunization Week, DW's Janelle Dumalaon meets those fighting the battle over who Americans trust with their children's health. We speak with Eric Feigl-Ding, an epidemiologist and health economist known for his work on global health risks, including