streptococcus mutans and streptococcus sobrinus detection by polymerase chain reaction and their relation to dental caries in 12 and 15 year-old schoolchildren in valencia (spain).a cross-sectional study was carried out to determine the prevalence of streptococcus mutans and streptococcus sobrinus and the association of the two in a random sample (n=614) of the child population of the region of valencia (spain). saliva samples were analyzed by the quantitative polymerase chain reaction (pcr) method to study the relation of these bacteria to caries prevalence and the dmft index. the prevalence of s. mutans was 35.4% at age 12 and 22.9% at age 15, that of s. sobrinus 18.9% ...201323722138
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