Ro. Mattos-graner et al., Genotypic diversity of mutans streptococci in Brazilian nursery children suggests horizontal transmission, J CLIN MICR, 39(6), 2001, pp. 2313-2316
Streptococcus mutans strains were isolated from cohorts of Brazilian nurser
y school children and genotyped by arbitrarily primed PCR and restriction f
ragment length polymorphism analysis. Of 24 children,vith two to five S. mu
tans isolates, 29% carried two or more genotypes. The presence of matching
genotypes of S. mutans among children attending one nursery suggests horizo
ntal transmission.