Polio eradication initiative.
D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D018563:Disease Notification / Q000379:methods*; D006801:Humans; D007114:Immunization; D007223:Infant; D011051:Poliomyelitis / Q000453:epidemiology* / Q000517:prevention & control*; D011159:Population Surveillance; D015030:Zimbabwe / Q000453:epidemiology