以前根据细菌的形态、血清型或基因型所做的横向分析表明:母亲是其婴儿变形链球菌(MS)的主要来源。本课题纵向研究了婴儿最初获得的MS基因型与其母亲的MS基因型的一致性。自婴儿出生到近3岁,每3个月1次采取口腔细菌样本。在34对母婴中,婴 A previous horizontal analysis based on bacterial morphology, serotypes or genotypes showed that the mother was the major source of their infant Streptococcus mutans (MS). This study longitudinally studies the consistency of the MS genotype initially acquired by an infant with that of her mother. From birth to nearly 3 years of age, oral bacteria samples are taken every 3 months. In 34 pairs of mother and child, baby