[Prevalence of Streptococcus mutans in a school group].

In the present study, S. mutans colony morphotypes has been investigated in salivary specimens obtained from 67 schoolchildren. Prevalence of these bacteria has been matched with DMFS in order to obtain information on cariogenicity of single morphotypes. Our data seems to suggest a correlation between total count of S. mutans colonies and caries experience, with major evidence for two colony morphotypes.