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Background: The human leukocyte antigen (HLA)-DQA1 locus is only moderately polymorphic compared to other HLA class II loci; however, we hypothesized that these polymorphisms could be important in determining the humoral antibody response to measles vaccine virus.Methods: The seroprevalence of measles antibody was determined in 881 school children who had been immunized with MMR-II at age approximately...