Polio-a pathogen on a precipice.
D006801:Humans; D015994:Incidence; D011051:Poliomyelitis / Q000453:epidemiology* / Q000517:prevention & control*; D023321:Poliovirus Vaccines / Q000276:immunology*; D014611:Vaccination / Q000706:statistics & numerical data*
D023321:Poliovirus Vaccines