Microbiology Harr |499 questions with correct answers

The aseptic collection of blood cultures requires that the skin be cleansed with: A. 2% iodin and then 70% alcohol solution B. 70% alcohol and then 2% iodine or an iodophor C. 70% alcohol and then 95% alcohol D. 95% alcohol only Answer Correct Answer: B When cleansing the skin with alcohol and then iodine for the collection of a blood culture, the iodine (or iodophor) should remain intact on the skin for at least: A. 10 sec B. 30 sec C. 60 sec D. 5 min Answer Correct Answer: C What is the purpose of adding 0.025%-0.050% sodium polyanetholsulfanate (SPS) to nutrient broth media for the collection of blood cultures? A. It inhibits phagocytosis and complement B. It promotes formation of a blood clot C. It enhances growth of anaerobes D. It functions as a preservative Answer Correct Answer: A A flexible calcium alginate nasopharyngeal swab in the collection device of choice for recovery of which organism from the nasopharynx? A. Staphylococcus aureus