Catalase test is used to differentiate ?
Staphylococcus aureus from staphylococcus epidermidis
Staphylococci from streptococci
Streptococcus pyogenes from other streptococci
None of the above
Ans. is 'b' i.e., Staphylococci from streptococci The catalase test is used to differentiate staphylococci (catalase-positive) from streptococci (catalase-negative). The enzyme, catalase, is produced by bacteria that respire using oxygen, and protects them from the toxic by-products of oxygen metabolism