Which of the following bacteria are all members of the Enterobacteriaceae family?

The correct choice identifies Salmonella, Shigella, and Escherichia coli as members of the Enterobacteriaceae family, which is a significant group of bacteria commonly found in the intestines of humans and animals. This family is known for its role in various infections and gastrointestinal conditions.

Salmonella is well-known for causing foodborne illnesses and typhoid fever, while Shigella is responsible for bacillary dysentery. Escherichia coli, particularly certain pathogenic strains, can lead to severe intestinal disease. All three of these bacteria share characteristics typical of the Enterobacteriaceae, such as being gram-negative rods and facultative anaerobes.

In contrast, the other choices contain bacteria that do not belong to the Enterobacteriaceae family. The second choice lists Staphylococcus, Enterococcus, and Bacillus, which are members of different families entirely, often associated with skin infections and digestive issues. The third option includes Clostridium, which is known for causing diseases like botulism and tetanus, along with Neisseria and Pseudomonas, which are unrelated to the Enterobacteriaceae. Lastly, Mycobacterium, Helicobacter, and Vibrio belong to yet other families,