MCB428 Fall 2016 Sample Exam without answers

Evidence of bacteria in the blood is taken to

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if the blood is sterile or contains bacteria. Evidence of bacteria in the blood is taken to indicate an infection (bacteremia). A. Two kinds of problems can arise with blood cultures which falsely indicate bacteremia . What are they? (4 pts) 8
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MCB428 Sample Exam Name_________________________________________ Fall 2016 Section : ______________________ B. What is usually done when performing a blood culture to check for the above false positive results and explain your answer? (4 pts) C. Would Gram staining the blood of a person with endocarditis be useful? Why or why not? (2 pts) 21.For each of the pairs of bacteria listed below, what would be the easiest and cheapest way to distinguish between the two bacteria? Name the test used with results obtained for each organism. Pick tests other than staining, microscopy, or the ICON DS Strep A test. A. S. aureus and S. pyogenes (3 pts) B. S. aureus and S. epidermidis (3 pts) 9
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MCB428 Sample Exam Name_________________________________________ Fall 2016 Section : ______________________ C. S. pyogenes and S. agalactiae (3pts) D. "Viridans" Strep and S. pyogenes (3 pts) E. Pseudomonas and E. coli (3 pts) 22.When and why would a woman be concerned about having Group B Streptococcus in her vagina? Include in your answer the name of the Group B Streptococcus of concern. (4 pts) 10
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