title: Vaccine-derived polioviruses--update.
mesh_terms: D004196:Disease Outbreaks / Q000517:prevention & control; D006801:Humans; D007153:Immunologic Deficiency Syndromes / Q000821:virology; D011051:Poliomyelitis / Q000453:epidemiology / Q000209:etiology / Q000517:prevention & control* / Q000821:virology; D017955:Poliovirus / Q000145:classification; D011055:Poliovirus Vaccine, Oral / Q000009:adverse effects; D023321:Poliovirus Vaccines / Q000009:adverse effects; D011159:Population Surveillance
chemical_list: D011055:Poliovirus Vaccine, Oral; D023321:Poliovirus Vaccines