Landmark perspective: Mass vaccination against polio.
D002648:Child; D003462:Cuba; D049673:History, 20th Century; D006801:Humans; D008800:Mexico; D011051:Poliomyelitis / Q000266:history* / Q000517:prevention & control; D011055:Poliovirus Vaccine, Oral / Q000266:history*; D013020:South America; D014330:Tropical Medicine; D014481:United States; D014611:Vaccination / Q000266:history*; D014613:Vaccines, Attenuated
D011055:Poliovirus Vaccine, Oral; D014613:Vaccines, Attenuated