International symposium on poliomyelitis control. Pan American Health Organization, Washington, D.C., March 14-17, 1983.
D006801:Humans; D011051:Poliomyelitis / Q000453:epidemiology* / Q000517:prevention & control*; D011054:Poliovirus Vaccine, Inactivated; D011055:Poliovirus Vaccine, Oral
D011054:Poliovirus Vaccine, Inactivated; D011055:Poliovirus Vaccine, Oral