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TCBS Agar, a vital tool in microbiology, owes its origins to Kobayashi et al's ingenious modifications to Nakanishi's selective medium. Initially crafted for V. cholerae and V. parahaemolyticus isolation, it hosts a vibrant array of Vibrio colonies, each with distinct morphologies. APHA champions its use for targeted Vibrio isolation. Enrichment in Alkaline Peptone Water followed by TCBS Agar plating remains a gold standard for V. cholerae isolation. Striking yellow colonies denote sucrose fermentation by V. cholerae, while V. alginolyticus echoes this hue. Conversely, V. parahaemolyticus and V. vulnificus sport blue-green shades. TCBS Agar's selectivity, albeit high for Vibrios, occasionally welcomes Pseudomonas and Aeromonas. H2S-negative colonies signal presumptive Vibrio presence, urging heavy fecal specimen inoculation for optimal growth.
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