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Questions and Answers
Which test could aid in the identification of Streptococcus pyogenes?
Which test could aid in the identification of Streptococcus pyogenes?
- Catalase test (negative)
- PYR test (positive) (correct)
- Oxidase test (negative)
- Coagulase test (positive)
A B-hemolytic, catalase-negative, gram-positive coccus resistant to bacitracin and sulfamethoxazole is likely to be:
A B-hemolytic, catalase-negative, gram-positive coccus resistant to bacitracin and sulfamethoxazole is likely to be:
- Group D streptococci
- Group A streptococci (correct)
- Enterococci
- Group B streptococci
The CAMP test is based on enhanced hemolysis between CAMP factor and B-lysin from:
The CAMP test is based on enhanced hemolysis between CAMP factor and B-lysin from:
- Staphylococcus epidermidis
- Enterococcus
- Streptococcus agalactiae (correct)
- Staphylococcus aureus
A nonhemolytic, catalase-negative, gram-positive coccus that is PYR positive is also expected to be:
A nonhemolytic, catalase-negative, gram-positive coccus that is PYR positive is also expected to be:
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The optochin test is most valuable in the identification of:
The optochin test is most valuable in the identification of:
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Study Notes
Identification of Streptococcus pyogenes
- B-hemolytic, catalase-negative, gram-positive coccus resistant to bacitracin and sulfamethoxazole is likely to be Streptococcus pyogenes.
CAMP Test
- The CAMP test is based on enhanced hemolysis between CAMP factor and B-lysin from Staphylococcus aureus.
Identification of Streptococcus pneumoniae
- A nonhemolytic, catalase-negative, gram-positive coccus that is PYR positive is also expected to be Streptococcus pneumoniae.
Optochin Test
- The optochin test is most valuable in the identification of Streptococcus pneumoniae.
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