MASS VACCINATION WITH ORAL LIVE-VIRUS VACCINE FOR PREVENTION OF POLIOMYELITIS IN THE USSR AND OTHER COUNTRIES.
D006801:Humans; D032541:Mass Vaccination; D011051:Poliomyelitis; D011055:Poliovirus Vaccine, Oral; D014586:USSR; D014613:Vaccines, Attenuated
D011055:Poliovirus Vaccine, Oral; D014613:Vaccines, Attenuated
POLIOVIRUS VACCINE, ORAL; USSR