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Viridans streptococci have the unique ability to synthesize dextrans from glucose, which allows them to adhere to fibrin-platelet aggregates at damaged heart valves. This mechanism underlies their ability to cause subacute valvular heart disease following their introduction into the bloodstream (e.g., following dental extraction ).
The anginosus group streptococci are members of the viridans streptococci group. [1] They have been implicated as etiologic agents in a variety of serious purulent infections, but because of their heterogeneous characteristics, these organisms may be unrecognized or misidentified by clinical laboratorians. [ 2 ]
Staphylococcus aureus is the most common cause of endocarditis in people who use intravenous drugs. [23] Viridans streptococci and Enterococci are the second and third most common organisms responsible for infective endocarditis. [11] Viridans streptococci are a common cause of infective endocarditis in South America.
Streptococcus pneumoniae and a group of oral streptococci (Streptococcus viridans or viridans streptococci) display alpha-hemolysis. This is sometimes called green hemolysis because of the color change in the agar. Other synonymous terms are incomplete hemolysis and partial hemolysis.
Group H streptococci cause infections in medium-sized canines. Group H streptococci rarely cause human illness unless a human has direct contact with the mouth of a canine. One of the most common ways this can be spread is human-to-canine, mouth-to-mouth contact. However, the canine may lick the human's hand and infection can be spread, as well ...
Streptococci. It is usually caused by a form of Viridans group streptococcus bacteria that normally live in the mouth [3] (Streptococcus mutans, mitis, sanguis or milleri). [2] Other strains of streptococci can cause subacute endocarditis as well.
The GC content of the S. sanguinis genome is 43.4% (higher than the GC contents of other streptococci). The genome encodes 2,274 predicted proteins , 61 tRNAs , and four rRNA operons . About 22% of the open reading frames are conserved hypothetical proteins (present in multiple species but having unknown functions), and approximately 645 of the ...
Granulicatella adiacens is a fastidious Gram-positive cocci (pairs, chains) and is part of the nutritionally variant streptococci (NVS). [2] [3] [4] Like other constituents of the NVS, it can cause bacteremia and infective endocarditis (IE), with significant morbidity and mortality.