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DOWNLOAD PDFStreptococcus bovis is classified as Group D Streptococcus, as it expresses the Lancefield D antigen. Lancefield Grouping is a classification system applied specifically to coagulase negative, catalase negative bacteria based on the composition of the carbohydrate antigens on their cell wall.
S. bovis is catalase-negative.
S. bovis is a gram positive coccus that grows in pairs or chains.
S. bovis characteristically will not grow on 6.5% salt, which differentiates it from Enterococcus.
However, S. bovis is able to grow in bile, similar to Enterococcus.
S. bovis is one of the bacteria commonly isolated in blood stream infections of patients with endocarditis. In the case of endocarditis, this bacteria seeds the heart valves and creates vegetations. The exact organism is S. gallolyticus, but is part of the S. bovis complex.
GDS bacteremia is known to be associated with various liver conditions such as cirrhosis and chronic hepatitis. It is thought that this is a result of dysfunction of the reticuloendothelial system which leads to poor bacterial clearance, thereby permitting entry of bacterial species into the circulation. For this reason, patients found to have GDS bacteremia should have a liver workup performed, including liver function tests and a hepatitis panel.
The association between GDS bacteremia, infectious endocarditis, and colonic neoplasia is well described. In the case of colonic neoplasm, the association is not fully understood. However, it has been suggested that it may be related to S. bovis (S. gallolyticus) binding to surface ligands that are over-expressed in colonic neoplasms.
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