For the Citrate Utilization test, what designates a positive result?
Name one positive organism.
The bromthymol blue in the agar is green in color to start. If the bacteria utilize citrate (the substrate), they will grow, produce alkaline end products, the pH will become basic, and the media/bromthymol blue will turn a royal blue color. (p. 67)
E. aerogenes is a bacteria which will produce the above positive result.