A boy with skin ulcer on leg, culture reveals beta hemolysis. Cultures from school children with sore throat some days back also revealed beta hemolysis. What is the similarity between both:: (A) Mec A gene is related to it, (B) M protein is same, (C) C carbohydrate antigen is same, (D) Strains causing both are same
Answer is C. Both of above mentioned conditions are caused by Group A STREPTOCOCCUS . Option 1 mec A gene Found in bacterial cells Responsible for resistance to antibiotics such as methicillin, penicillin, erythromycin, tetracycline The most commonly known carrier of the mec A gene is MRSA. Option 2, 4 Strains causing skin infection and throat infection are different and belong to different 'M' serotypes. Option 3 The carbohydrate 'C' antigen is group specific, i.e. beta- hemolytic group A Streptococci (Str. pyogenes) have same 'C' antigen.