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Micro Streptococci

Micro106 - Streptococci characteristics & tests

QuestionAnswer
What are streptococci? Streptococci are gram-positive cocci that form chains.
Where are Streptococci commonly found? Streptococci can be found in the upper respiratory tract and oral cavity.
What is beta-hemolytic? The ability to completely destroy red blood cells in blood agar, producing a clear zone around the colony.
What is alpha-hemolytic? The partial hemolysis of red blood cells that produces a green or brownish zone around colonies.
What are viridans? The alpha-hemolytic group of Streptococci.
How does the Lancefield group classify streptococci? The Lancefield groupings classify streptococci based on the carbohydrate antigens associated with the cells.
What are the characteristics of S.pyogenes? S. pyogenes is in the A Lancefield group, sensitive to Bacitracin, and beta-hemolytic.
What are the characteristics of S. pneumoniae? S. pneumoniae is not part of a Lancefield grouping, is alpha-hemolytic and optochin sensitive.
What is the classic sign of CAMP test? An arrowhead formation of hemolysis on a blood agar plate.
Created by: jrb265
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