Join an investigation into the science and politics of vaccine safety. Despite a scientific consensus that there is no link between vaccines and disorders like autism, the war over whether to immunize children continues. If a few un-immunized children catch a dangerous disease, it can suddenly threaten thousands of children and adults alike, sparking a pandemic. Maybe social science, popular education, and public policy are as important as medical science when it comes to keeping a human society healthy. Read more at www.pbs.org/wgbh/frontline/film/vaccines.