title: Yellow fever in 1989 and 1990.
mesh_terms: D000293:Adolescent; D000328:Adult; D000349:Africa / Q000453:epidemiology; D002648:Child; D002675:Child, Preschool; D003430:Cross-Sectional Studies; D004196:Disease Outbreaks; D006801:Humans; D015994:Incidence; D007223:Infant; D013020:South America / Q000453:epidemiology; D014944:World Health Organization; D015004:Yellow Fever / Q000401:mortality*