title: Outbreak news. Yellow fever, Sierra Leone.
mesh_terms: D000293:Adolescent; D000328:Adult; D004196:Disease Outbreaks; D005260:Female; D006801:Humans; D008297:Male; D032541:Mass Vaccination; D012807:Sierra Leone / Q000453:epidemiology; D015004:Yellow Fever / Q000453:epidemiology* / Q000517:prevention & control