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Streptococcus oralis

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A gram-positive commensal and non-motile facultative cocci bacterium associated as normal micro-flora in oral cavity.


Streptococcus oralis is able to grow at temperature ranging from 30’C-35’C with circular chromosome containing 1,909 coding proteins. It has metabolic capabilities that survive in more adverse environmental conditions enabling to consume better range of nutrients through breaking down of glycoproteins. It also functions as probiotic helping in restoring the mouth good bacteria and keeping out bad bacteria that deteriorate oral health.

Streptococcus oralis is part of the normal oral microbiota in human that has the capacity of opportunistic pathogenicity where it demonstrates considerable phenotypic as well as genetic variation. It is the first bacterium identified to form plaque biofilm where it is considered as the most common disease affecting human oral cavity.

Streptococcus oralis is associated as opportunistic pathogens that affect immunocompromised individuals and those with hematologic cancers. It is implicated in bacterial endocarditis, streptococcal shock and adult respiratory distress syndrome however in some cases it cause bacterial meningitis.

Scientific classification:

Domain: Bacteria

Phylum: Firmicutes

Class: Bacilli

Order: Lactobacillales

Family: Streptococcaceae

Genus: Streptococcus

Species: Streptococcus oralis

See also:

• Bacteria

• Oral cavity

• Dental plaque