Purulent material is obtained from a carbuncle and submitted…
Purulent material is obtained from a carbuncle and submitted for bacterial culture. The direct smear reveals many gram-positive cocci and white blood cells. The culture shows growth in the primary broth and on the sheep blood agar plate and no growth on the MacConkey agar plate. The colonies on the blood agar plate are butyrous, white, and beta-hemolytic. Both glucose and mannitol are fermented. Although the slide coagulase test is negative, the tube coagulase test is positive. The most probable identity of this isolate is: Micrococcus lysodeikticus Staphylococcus epidermidis Staphylococcus aureus Staphylococcus saprophyticus
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