A 15 year old boy is on the wrestling team. His mother notices odd brownish sore

Question

A 15 year old boy is on the wrestling team. His mother notices odd brownish sores around his mouth and nose and takes him to the family doctor. A culture is ordered from those sores. Blood: beta hemolysis, pinpoint, transparent colonies Chocolate: pinpoint, transparent colonies MacConkey: no growth Gram stain of colonies on blood plate: GPC in chains Catalase: no bubbles Result of catalase: negative A-disk: Is this organism resistance or sensitive to the A-disk? What is in the A-disk? Identification (genus and speces) Identification (Lancefield group)

Explanation / Answer

A) This organism is sensitive to the A- disk that is a bacteriacin test as zone if inhibition can be seen.

B) In the A- disk impregnated bacteriacin is present to see the presence of group A Streptococcus.

C) genus is Streptococcus

Species is pyogens. We can determine this because of zone of inhibition is present in the petri dish. A- disk test is used to determine the presence of the group A Streptococcus.

D) lancefield group is GROUP A Streptococcus.

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