Separate Venipunctures Were Performed to Collect Three Sets of Blood

question 19

Multiple Choice

Separate venipunctures were performed to collect three sets of blood cultures from a patient with an artificial heart valve. The first and third sets grew a gram-positive pleomorphic rod in 1 of 2 bottles while the second set had no growth in either bottle. What is the most likely explanation for these findings?

• A) The patient probably has an infection with Clostridium spp.
• B) The blood cultures were contaminated with skin biota.
• C) The blood cultures were probably contaminated in the laboratory.
• D) The patient probably has an infection with Bacillus spp.

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