A voided urine culture from a 46-year-old female grows dark lactose fermenting as well as non-lactose fermenting colonies. The BAP shows gray, beta-hemolytic colonies under a swarming film of growth. The microbiologist performs a spot indole test on swarming colony and it is positive. She reports the organism as presumptive Proteus vulgaris using the department's rapid identification criteria. The next day the second colony identifies as E. coli using a commercial identification system. Your next step in this process is to

Question

Quizplus · Accepted Answer

C) The correct next step is to identify the non-lactose fermenting, swarming colony using a commercial identification system. This is because the initial identification of Proteus vulgaris was based on rapid identification criteria, which might not be as accurate as a commercial identification system. Given the presence of a swarming colony, which is characteristic of Proteus species, and a positive spot indole test, further confirmation using a more reliable method is prudent to ensure accurate identification.

A Voided Urine Culture from a 46-Year-Old Female Grows Dark