title: Oral poliovirus vaccine (OPV) and intussusception.
mesh_terms: D016022:Case-Control Studies; D015984:Causality; D015331:Cohort Studies; D014943:Global Health; D006801:Humans; D007443:Intussusception / Q000453:epidemiology / Q000209:etiology*; D011055:Poliovirus Vaccine, Oral / Q000009:adverse effects*; D011159:Population Surveillance
chemical_list: D011055:Poliovirus Vaccine, Oral