HESI Test bank Questions already passed

1. The most frequent agent of nosocomial bacteremia is: A. catalase-negative micrococci. B. coagulase-positive staphylococci. C. catalase-negative stomatococci. D. coagulase-negative staphylococci- D The species of Staphylococcus, which is one of the most important human pathogens, is: A. S. lentus. B. S. aureus. C. S. mucilaginosus. D. S. intermedius- B Which group of bacteria is described as catalase positive and is gram-positive cocci that grow facultatively anaerobic and form grapelike clusters? A. Neisseria B. Rothia (stomatococci) C. Staphylococcus D. Micrococcus- C The first identification test performed on a clinical isolate of gram-positive, catalase-positive cocci would likely be the: A. penicillin test. B. Gram stain. C. oxidase test. D. coagulase test- D The slide coagulase test is a rapid screening test for the production of: A. clumping factor. B. free coagulase. C. extracellular coagulase. D. catalase.- A A tube coagulase test was performed on catalase-positive, gram-positive cocci that were beta hemolytic and grew on mannitol salt agar. The tube was checked after overnight incubation and was negative. Which of the following statements explains this discrepancy? A. A tube coagulase should not be performed on a catalase-positive organism. B. A beta-hemolytic colony, which is catalase positive and grows on mannitol salt, is normally coagulase negative. C. The test should have been read in 1 to 4 hours in case any hemolysins are present. D. No discrepancy is present; the results are accurate- C The tube coagulase test: A. detects bound coagulase. B. detects extracellular coagulase. C. is performed on slide coagulase-positive isolates to confirm a positive result. D. requires citrated reagent plasma- B In clinical isolates, the most likely identification of coagulase-positive, catalase-positive, gram-positive cocci that are penicillin resistant would be: A. Staphylococcus aureus. B. Staphylococcus intermedius. C. Stomatococcus luteus. D. Micrococcus aureus- A Which virulent and important human pathogen can also be recovered from the nares, perineum, and other skin sites of healthy people, especially in the hospital setting? A. Micrococcus luteus B. Staphylococcus intermedius C. Staphylococcus aureus D. All Micrococcaceae- C The resident human flora, staphylococcus, which is more likely to cause infections in compromised hosts such as patients with cancer, is: A. S. saprophyticus. B. S. aureus. C. S. epidermidis. D. S. intermedius- C The Staphylococcaceae staphylococcus that is more likely to cause uncomplicated urinary tract infections in nonhospitalized hosts, especially sexually active young women, is: A. S. saprophyticus. B. S. aureus. C. S. epidermidis. D. S. intermedius.- A Isolates of coagulase-negative Staphylococcus from urinary tract infections can be presumptively identified as S. saprophyticuson the basis of its: