INBDE (Integrated National Board Dental Examination) Practice Exam

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Which bacteria feed on sugars and carbon and are considered early colonizers?

  1. Staphylococcus and E. coli

  2. E. coli and Pseudomonas

  3. Streptococcus (except for salivarius) and Actinomycetes

  4. Streptococcus salivarius and Lactobacillus

The correct answer is: Streptococcus (except for salivarius) and Actinomycetes

Early colonizers in the oral cavity are typically bacteria that feed on sugars and carbon sources. Streptococcus (except for salivarius) and Actinomycetes are known for their ability to utilize sugars as a food source and are among the initial bacteria to colonize the oral cavity after birth. Staphylococcus, E. coli, Pseudomonas, Streptococcus salivarius, and Lactobacillus do not primarily feed on sugars and are not considered early colonizers in the oral cavity.

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