<prompt> Early detection of Streptococcus pyogenes is by?BacitracinOxaciliicinMethidllinOptochin  <response>: ANSWER: A BacitracinREF: Jawetz Microbiology, 24th Ed, Ch. 15See previous questionStreptococcus pyogenes are PYR-positive hydrolysis of L-pyrrolidonyl-2-naphthylamide and usually are susceptible to bacitracin. 