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5617 Microbiology

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 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

ACoagulase negative staphylococcus
BStaphylococcus aureus
CStreptococcus viridans
DEnterococcus feaecium
Microbiology
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5625 Microbiology

A 37 year old man is admitted to the hospital with shoness of breath, cyanosis, and fever. Chest x-ray films reveal consolidation of the right lower lobe with relative sparing of the remaining lobes.A clinical diagnosis of lobar pneumonia is made and suppoed by the results of sputum cultures. Which of the following is the genus of the bacterium most likely to be isolated from this patient’s sputum?

AHaemophilus
BKlebsiella
CStreptococcus, alpha-hemolytic
DStreptococcus, beta-hemolytic
Microbiology
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