After being on the verge of eradication globally, with the last case in Canada nearly 30 years ago, polio is once again making headlines. Cases are emerging in the U.S., Israel and the U.K., and that has health officials on alert. Guest host Nora Young speaks with Safia Ibrahim, a polio survivor and global vaccine advocate. We also hear from Dr. Olakunle Alonge, an associate professor of International Health at Johns Hopkins University, and Dr. Allison McGeer, an infectious disease physician at Sinai Health System in Toronto.