title: Measles--United States, 1989 and first 20 weeks 1990.
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D004196:Disease Outbreaks; D006801:Humans; D015994:Incidence; D007223:Infant; D008457:Measles / Q000150:complications / Q000453:epidemiology* / Q000276:immunology; D014481:United States / Q000453:epidemiology; D014611:Vaccination