Not only is this group of gram-negative bacteria considered normal flora of the gastrointestinal tract of humans and animals, but also it contains agents of important diseases such as gastroenteritis and enteric fevers, urinary tract infections, and bacterial pneumonia.

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The Enterobacteriaceae family is a group of gram-negative bacteria that are normal inhabitants of the gastrointestinal tract of humans and animals, but also includes some important pathogens that can cause diseases such as gastroenteritis and enteric fevers, urinary tract infections, and bacterial pneumonia. The other choices are not as relevant to the description given.

Not Only Is This Group of Gram-Negative Bacteria Considered Normal