Progress towards poliomyelitis eradication in Nigeria, January 2002 to March 2003.
D006801:Humans; D017589:Immunization Programs; D009549:Nigeria / Q000453:epidemiology; D011051:Poliomyelitis / Q000453:epidemiology* / Q000517:prevention & control*; D011055:Poliovirus Vaccine, Oral / Q000008:administration & dosage; D011159:Population Surveillance
D011055:Poliovirus Vaccine, Oral