<prompt> 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:Mec A gene is related to itM protein is sameC carbohydrate antigen is sameStrains causing both are same  <response>: 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. 