A 15 yeаr оld bоy cоmes in complаining of а sore throat and fever x 2 days. He denies cough, congestion, nausea, vomiting or diarrhea. On physical exam, his temperature is 102.5 degrees F, he has white exudate on his tonsils and enlarged, tender, anterior cervical lymph nodes. You choose to run a rapid strep test and send out throat culture. What bacteria are you looking for when you perform these tests?