title: Letter: Protection by pertussis vaccine.
mesh_terms: D002675:Child, Preschool; D004673:Encephalomyelitis, Acute Disseminated / Q000453:epidemiology; D006801:Humans; D007223:Infant; D010567:Pertussis Vaccine / Q000009:adverse effects*; D012640:Seizures / Q000209:etiology; D013548:Sweden; D006113:United Kingdom
chemical_list: D010567:Pertussis Vaccine