title: Wild poliovirus importations in west and central Africa, January 2003--March 2004.
mesh_terms: D000350:Africa, Central / Q000453:epidemiology; D000354:Africa, Western / Q000453:epidemiology; D006801:Humans; D017589:Immunization Programs; D011051:Poliomyelitis / Q000453:epidemiology* / Q000517:prevention & control / Q000635:transmission; D017955:Poliovirus / Q000302:isolation & purification*; D023321:Poliovirus Vaccines / Q000008:administration & dosage; D011159:Population Surveillance
chemical_list: D023321:Poliovirus Vaccines