An 11-year old boy presents with severe throat pain, fever and joint pain lasting more than a week. His parents indicate

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An 11-year old boy presents with severe throat pain, fever andjoint pain lasting more than a week. His parents indicate that hehas had similar episodes in the past two years and but nottreated. Further investigation shows the involvement of the heart.Culture of throat swab identifies Gram-positive, beta hemolyticcocci that are sensitive to bacitracin, positive for l-pyrrolidonyl arylamidase (PYR) test and expresses Lancefield GroupA antigen. What is the likely causative agent of thiscondition?
a.
Staphylococcus saprophyticus
b.
Streptococcus pneumoniae
c.
Streptococcus pyogenes
d.
Staphylococcus aureus
e.
Staphylococcus epidermidis
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