Progress toward poliomyelitis eradication--Chad, 1996-1999.
D002596:Chad / Q000453:epidemiology; D006801:Humans; D017589:Immunization Programs; D011051:Poliomyelitis / Q000453:epidemiology* / Q000517:prevention & control*; D011055:Poliovirus Vaccine, Oral / Q000008:administration & dosage; D014611:Vaccination / Q000706:statistics & numerical data
D011055:Poliovirus Vaccine, Oral