摘要：Aims: The purpose of this study was to determine if Streptococcus mutans have adapted to the polluted condition present among this population, adolescents 11-15 years of age with and without caries, and the resistance of this organism to grow at different concentrations of lead (Pb). Methodology: In Diagram 1. Summary of the different stages of experimental development are briefly explained in the following paragraphs. Results: The present investigation was made because contamination by chemical substances (heavy metals) represents an important health risk. We chose the community of San Baltazar Tetela, Puebla-México as our study site since it experiences noticeable environmental contamination because of industrial emissions and run-off generated by the storage of these polluting agents in the Manuel Avila Camacho dam (Valsequillo Lake). This study not only allowed us to quantify the concentration of lead in the blood of adolescents living in this community, but also to establish its possible association with socio-economic factors. On the other hand we isolated and identify Streptococcus mutans from saliva in teenagers. The mean blood lead value has a value of 7.89 μg/dL of blood (Graph. 3) in the lower levels to 10 μg / dL, with lead levels greater 10 μg / dL of blood is 13. 18; not having statistically significant difference in applying the test, based on the weight and height of children with and without elevated lead, on the other hand the average value of CPO in children with normal blood lead was 3.99 (Graph.4), while children with higher lead levels to 10 μg / dL of blood, had a 7.41 CPO.
关键词：Environmental pollution; lead (Pb); Manuel Avila Camacho dam (Valsequillo Lake); CPO (decay index) colony forming units (UFC).
