title: Expanded programme on immunization. International importations of measles from the Americas into the United States, 1990-1994.
mesh_terms: D004641:Emigration and Immigration; D006801:Humans; D017589:Immunization Programs; D008457:Measles / Q000453:epidemiology* / Q000517:prevention & control*; D014481:United States / Q000453:epidemiology