Expanded programme on immunization. Poliomyelitis in 1993.
D000349:Africa / Q000453:epidemiology; D005060:Europe / Q000453:epidemiology; D006801:Humans; D017589:Immunization Programs; D015994:Incidence; D011051:Poliomyelitis / Q000453:epidemiology* / Q000517:prevention & control*