The @WHO declared Africa free of wild poliovirus last year. On the first anniversary, 3 polio survivors share their stories about living with polio and their hopes of a polio-free world. #ph260720 #polio #poliofree Before #vaccines were developed, patients were put inside tank respirators known as “iron lung” to help them breathe during the early stages @CDCgov #ph260720 #polio #ironlung #cdcphil