MacConkey agar serves which purpose when used in the bacterial fecal culture?

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The moderately selective agar should support growth of most Enterobacteriaceae, vibrios, and other possible pathogens; MacConkey agar works well. Some laboratories use eosin-methylene blue (EMB), which is slightly more inhibitory. All lactose-negative colonies should be tested further, ensuring adequate detection of most vibrios and most pathogenic Enterobacteriaceae. Lactose-positive vibrios (V. vulnificus), pathogenic E. coli, some Aeromonas spp., and Plesiomonas spp. may not be distinctive on MacConkey agar.

MacConkey Agar Serves Which Purpose When Used in the Bacterial