[Variability of the serogroups of beta-hemolytic streptococci in groups of adolescents studied in a pilot project].

The present is the report of a pilot on the distribution per serologic groups of Streptococcus-hemolyticus strains isolated from children in a vocational school and a specialized secondary school. The prevalence of streptococci group C was observed. In the vocational school there was an evident increase in the number of group C strains, especially in the course of the 2nd and 4th terms, whereas in the other school group C strains were present in all terms, especially the 4th. Penicillin in injections, administered preventively and curatively in the vocational school was followed by variation of the serogroups, whereas in the specialized secondary school Streptococcus group C was present in a proportion of 100% in the 4th term, which actually represents the situation in this community before institution of the treatment. Attention is drawn to the fact that group C shows a tendency to prevail over a group A in certain ecologic sites, under the influence of the state of reactivity of the adolescents, survey and treatment of streptococcal infections and environmental conditions.