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1982年,瑞典开始对18月龄和12岁儿童实行麻疹-腮腺炎-风疹（MMR）疫苗的2针免疫程序。为评价疫苗的免疫原性,作者于1990年对476名12岁儿童用MMR疫苗进行加强免疫,并在接种前及接种后2个月分别用
In 1982, Sweden began a 2-dose immunization program for measles-mumps-rubella (MMR) vaccines for children 18 months of age and 12 years of age. To assess the immunogenicity of the vaccine, the authors immunized 476 12-year-old children with the MMR vaccine in 1990 and used them separately before vaccination and 2 months after vaccination