Staphylococci and Streptococci

You determine that your patient is infected with a gram positive cocci. You decide to test for the enzyme catalase. Your test comes up positive for catalase. Which type of cocci do you have?



A lab incubates a streptococcus sample overnight on a blood agar plate. The next day there is a clear zone of hemolysis around the sample colony. In which category does this sample belong?




Which "hemolytic streptococcus" group is unable to lyse RBCs, and is technically non-hemolytic?