Which organism is commonly associated with foodborne illness among Enterobacteriaceae?

• A. Proteus vulgaris
• B. Serratia marcescens
• C. Salmonella typhimurium
• D. Morganella morganii

Answer: (C)

Salmonella typhimurium is well-known as a significant pathogen associated with foodborne illness, particularly in the context of Enterobacteriaceae. This organism is commonly implicated in outbreaks linked to contaminated food, especially undercooked poultry, eggs, and other animal products.

The association of Salmonella typhimurium with foodborne illness is largely due to its virulence factors, which enable it to survive in the gastrointestinal tract of humans and animals, leading to infection. It produces toxins that can lead to gastrointestinal disturbances, resulting in symptoms such as diarrhea, fever, and abdominal cramps.

In contrast, while other organisms in the Enterobacteriaceae family may have clinical significance, they are not as frequently associated with foodborne illness as Salmonella typhimurium. For example, Proteus vulgaris and Morganella morganii are typically more associated with urinary tract infections, and Serratia marcescens is known for nosocomial infections rather than foodborne transmission. Thus, Salmonella typhimurium is clearly the organism that fits the profile for foodborne illness within the Enterobacteriaceae family.