How to differentiate between staphylococci and micrococci?: (A) Catalase test, (B) Modified Oxidase test, (C) Gram staining, (D) AFS
Answer is B. Micrococci:Micrococci are gram-positive cocci which occur mostly in pairs, tetrads or irregular clusters. They are catalase and modified oxidase positive and aerobic. They are ordinarily non-pathogenic. The resemble Staphylococci, but in general, they are large in size and tetrads. The common laboratory test used to differentiate between micrococci and staphylococci is modified oxidase test.Ref: Ananthanarayan 9th edition, p206