Microbiology – MCQ 28 – Bacterial infection in a patient put on central venous line

A patient admitted to an ICU is on 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 an his blood culture is positive for gram positive cocci in chains, which are catalase negative. Following this, vancomycin was started but the culture remained positive for the same organism even after 2 weeks of therapy. The most likely organism causing infection is:
a) Staphylococcus aureus
b) Viridans streptococci
c) Enterococcus faecalis
d) Coagulase negative Staphylococcus

Correct answer : c) Enterococcus faecalis

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