<prompt> Catalase positive, beta-hemolytic staphylococcus:S. aureusS. epidermidisS. saprophyticusNone  <response>: Ans. is a i.e., S. aureus Ref: Essentials of Medical Microbiology, p. 779 All staphylococci are catalase positive. Amongst staphylococci, Staph, aureus and Staph, haemolyticus CONS are beta hemolytic. Most species of coagulase negative staphylococcus species are non-hemolytic except Staph, haemolyticus. Staphylococcus haemolyticus is a member of the coagulase-negative staphylococci CoNS. It is part of the skin flora of humans, and its largest populations are usually found at the axillae, perineum, and inguinal areas. S. haemolyticus also colonizes primates and domestic animals. It is a well-known opportunistic pathogen, and is the second-most frequently isolated CoNS S. epidermidis is the first. 