Measles surveillance. 1982-1990.
D000293:Adolescent; D001530:Belgium / Q000453:epidemiology; D002648:Child; D002675:Child, Preschool; D003430:Cross-Sectional Studies; D006801:Humans; D015994:Incidence; D007223:Infant; D008457:Measles / Q000150:complications / Q000453:epidemiology* / Q000517:prevention & control; D011159:Population Surveillance; D012621:Seasons