Microbiology – MCQ 7 – A farmer presents with pustules, which show Gram Positive Cocci on smear.

A farmer presents with pustules, which show Gram Positive Cocci on smear. Culture shows Beta hemolysis, and organisms are Catalase negative. To show that the identified organism is group A streptococci, which of the following test should be done?
A. Bacitracin sensitivity
B. Optochin sensitivity
C. Novobiocin sensitivity
D. Bile solubility

Correct answer : A. Bacitracin sensitivity

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