Addition of acid fuchsin produces pink colonies by lactose fermenters.
CLED Agar (Cystine-Lactose-Electrolyte-Deficient) media was first formulated by Sandys and later modified by Mackey and Sand. In the presence of the indicator dye, bromthymol blue, lactose-fermenting bacteria produce yellow colonies while non-lactose fermenting bacteria give blue colonies. Bevis incorporated an additional dye, acid fuchsin, causing lactose fermenting bacteria to produce bright pink colonies and non-lactose fermenting bacteria to show colorless. This medium supports the growth of urinary pathogens and give good colonial differentiation of these bacteria. Since there are no salts (electrolyte-deficient) in this media the swarming of Proteus sp. is suppressed. Various authors have used CLED Agar, Bevis as a dip inoculum transport medium for urine specimens. A quantitative count method for urine cultures called the Drop Plate method was devised by Neblett.
Storage:
Store the sealed bottle containing the dehydrated medium at 2 to 30.0 degrees C. Once opened and recapped, place the container in a low humidity environment at the same storage temperature. Protect it from moisture and light. The dehydrated medium should be discarded if it is not free flowing or if the color has changed from the original light beige color.
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