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Growth of Salmonella on XLD agar plates after enrichment. Salmonella spp. were incubated in GN broth, SGN broth, SF broth, and SBG broth. After either 6 or 24 h of enrichment, the cultures were inoculated onto XLD agar plates. The salmonellae appear as pink colonies with black centers. The yellow colonies are the coliforms with the characteristics of lactose-fermentative organisms.
