title: A continuing focus of yellow fever in the Apurimac River Valley, Ayacucho, Peru, and the first isolation of yellow fever virus in that country.
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D004196:Disease Outbreaks / Q000453:epidemiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010568:Peru; D015004:Yellow Fever / Q000453:epidemiology*; D015005:Yellow fever virus / Q000302:isolation & purification*