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2332 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-

AStaphylococcus aureus
BViridans streptococci
CEnterococcus faecalis
DCoagulase negative Staphylococcus
Microbiology
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2339 Microbiology

Of the five immunoglobulin classes, IgA is the main immunoglobulin of secretions from the genital, respiratory, and intestinal tracts. As a result, IgA antibody is the first line of defense against infections at the mucous membrane. It is usually an early specific antibody. Which of the following statements most accurately describes IgA?

AComplement fixation tests for IgA antibody will be positive if specific IgA antibody is present
BIgA can be destroyed by bacterial proteases
CIgA is absent in colostrum
DIgA is not found in saliva; therefore, an IgA diagnostic test on saliva would have no value
Microbiology
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