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6492 Microbiology

A patient admitted to an ICU is on a central venous line for the last one week. He is on ceftazidime and amikacin. After 7 days of antibiotics, he develops a spike of fever and his blood culture is positive for gram-positive cocci in chains, which are catalase negative. Following this, vancomycin was staed but the culture remained positive for the same organism even after 2 weeks of therapy. The most likely organism causing infection is

AStaphylococcus aureus
BStreptococci viridans
CEnterococcus faecalis
DCoagulase negative Staphylococcus
Microbiology
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