A patient in an ICU is on central venous line for the past 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 started but the culture remained positive for the same organism even after 10 days therapy.The most likely organism causing this infection is

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Coagulase negative staphylococcus

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Staphylococcus aureus

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Virdans streptococci

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Enterococcus faecalis

1.	A patient in an ICU is on central venous line for the past 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 started but the culture remained positive for the same organism even after 10 days therapy.The most likely organism causing this infection is
A.	Staphylococcus aureus
B.	Virdans streptococci
C.	Enterococcus faecalis
D.	Coagulase negative staphylococcus
Answer» D. Coagulase negative staphylococcus

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