Which bacteria can not cause hemolysis on bloody agar plate?
A. Streptococcus varidans,
B. Streptococcus pyogenes,
C. Streptococcus nonhemolyticus
D. Staphylococcus aureus.
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Which one is the property of the hemolytic cycle surrounding the colony of S. pyogenes on bloody plate.
A. Green cycle in diameter of 1-2mm;
B. Transparent cycle in diameter of 1-2mm;
C. Transparent cycle in diameter of 2-4mm;
D. Green cycle in diameter of 2-4mm;
Which species of streptococcus has higher virulence?
A. Streptococcus pyogenes,
B. Streptococcus varidans,
C. Streptococcus nonhemolyticus
D. All have
20 groups of streptococcus are classified based on ____ antigen in Lancefield classification system.
A. Capsule antigen;
B. M protein
Cell wall
D. R
Each statement is right about group A streptococcus EXCEPT___?
A. 90% pathogenic streptococcus is in Group A.
B. Most streptococci containing the group A antigen are S pyogenes.
C. Most streptococcus in Group A cause α- hemolysis.
D. Group A Streptococcus, which is synonymously known as S.pyogenes
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