Plans to eradicate polio hit by virus outbreak in Bulgaria.
Schrope
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D002031:Bulgaria / Q000453:epidemiology; D002648:Child; D002675:Child, Preschool; D004196:Disease Outbreaks; D006801:Humans; D017589:Immunization Programs; D011051:Poliomyelitis / Q000453:epidemiology* / Q000517:prevention & control / Q000821:virology; D017955:Poliovirus; D023321:Poliovirus Vaccines / Q000008:administration & dosage; D014944:World Health Organization
D023321:Poliovirus Vaccines