POLIOVIRUS VARIATION AND THE PRODUCTION OF ATTENUATED STRAINS FOR VACCINES.
D030015:Enterovirus C, Human; D006801:Humans; D017955:Poliovirus; D011055:Poliovirus Vaccine, Oral; D023321:Poliovirus Vaccines; D014612:Vaccines
D011055:Poliovirus Vaccine, Oral; D023321:Poliovirus Vaccines; D014612:Vaccines
POLIOVIRUS VACCINE, ORAL