National Vaccine Information Center: Polio polio polio National Vaccine Information Center: Polio polio Oral Polio Vaccine Oral Polio Vaccine National Vaccine Information Center – Polio/SV40 National Vaccine Information Center: Polio http://www.nvic.org/Vaccines-and-Diseases/Polio-SV40.aspx National Vaccine Information Center: Polio Oral Polio Vaccine NVIC's Polio Information Page