A gram positive coccus from the urine of a young woman is catalase positive, coagulase negative, and resistant to novobiocin. Which organism is most likely?
1Staphylococcus epidermidis
2Staphylococcus aureus
3Staphylococcus saprophyticus✓ 정답
4Enterococcus faecalis
해설
Among the coagulase-negative staphylococci, resistance to novobiocin identifies Staphylococcus saprophyticus. The clinical setting of a urinary tract infection in a young woman is an additional clue. Staphylococcus epidermidis is susceptible to novobiocin.