All of the following bacteria can cause foodborne illness except:

• A. Salmonella enterica
• B. Lactobacillus acidophilus
• C. Campylobacter jejuni
• D. Escherichia coli O157:H7

Answer: (B)

Verified step by step guidance

1. Step 1: Understand the question is asking to identify which bacterium does NOT cause foodborne illness among the listed options.
2. Step 2: Review the characteristics of each bacterium: Salmonella enterica, Campylobacter jejuni, and Escherichia coli O157:H7 are well-known pathogens that cause foodborne illnesses.
3. Step 3: Recognize that Lactobacillus acidophilus is generally considered a beneficial bacterium, commonly found in probiotics and used in food fermentation, and is not associated with causing foodborne illness.
4. Step 4: Compare the roles of each bacterium in relation to food safety, noting that the first three are pathogenic while Lactobacillus acidophilus is not.
5. Step 5: Conclude that Lactobacillus acidophilus is the exception because it does not cause foodborne illness, unlike the other listed bacteria.