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;
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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
Which following one of the streptococcal toxic molecules is not involved in dissemination of Streptococcus?
A. pyrogenic exotoxins ,
B. hyaluronidase,
C. Streptokinase,
D. streptodornase,
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