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Streptococcus mitis

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A gram-positive nonmotile facultative anaerobes and non-spore forming commensal bacterium involved in odontogenic infection and endocarditis in human.


Streptococcus mitis normally arranged in chains with a cocci shape and survive at temperatures ranging from 30’C-35‘C that generates ATP through aerobic respiration if oxygen is available but can undergo fermentation in scarcity of oxygen. Its genome consists of a circular chromosome with 2149 coding protein genes and has sparsely distributed long fibrils with soft cell surfaces and C-polysaccharide cell wall that contains repeating units of phosphocholine and galactosamine residues.

Streptococcus mitis is a commensal bacterium that inhabits the solid surface of the oral cavity including dental hard tissues and mucous membranes. It is hemolytic which able to breakdown red blood cells and is part as an oral flora that does not pathogenic yet usually causes bacterial endocarditis.

Streptococcus mitis metabolism is very versatile that able to utilize and synthesize intracellular glycogen and lactate catabolism. It is the normal flora of throat, mouth and nasopharynx and known as a causative agent of otitis, pneumonia, meningitis and sepsis.

Scientific classification:

Kingdom: Bacteria

Phylum: Firmicutes

Class: Bacilli

Order: Lactobacillales

Family: Streptococcaceae

Genus: Streptococcus

Species: Streptococcus mitis

See also:

• Bacteria

• Dental plagues