Enteric bacteria are typically Gram-negative, meaning they do not retain the crystal violet stain used in the Gram staining procedure and appear pink or red after counterstaining. This classification includes a wide range of bacteria found in the intestinal tract, such as Escherichia coli and Salmonella. Some enteric bacteria, like certain species of Enterococcus, can be Gram-positive. However, the majority are Gram-negative and are characterized by a thin peptidoglycan layer and an outer membrane.
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