PROBLEMS IN THE DEVELOPMENT AND USE OF ORAL POLIOVIRUS VACCINE.
D006801:Humans; D017955:Poliovirus; D011055:Poliovirus Vaccine, Oral; D023321:Poliovirus Vaccines
D011055:Poliovirus Vaccine, Oral; D023321:Poliovirus Vaccines
POLIOVIRUS; POLIOVIRUS VACCINE, ORAL