Which Enterobacteriaceae is known for causing typhoid fever?

• A. E. coli
• B. Klebsiella pneumoniae
• C. Salmonella typhi
• D. Shigella sonnei

Answer: (C)

Salmonella typhi is the causative agent of typhoid fever, a serious illness characterized by prolonged fever, abdominal pain, and systemic illness. This bacterium is part of the Salmonella genus, which is known for its ability to invade the intestinal mucosa and spread into the bloodstream, leading to systemic disease.

Salmonella typhi is unique in its adaptation to humans, as it does not typically exist in animal reservoirs like many other Enterobacteriaceae. The transmission occurs through contaminated food and water, which makes sanitation and hygiene critical in preventing outbreaks of typhoid fever. The disease can be severe if untreated, but it is effectively manage with antibiotics and can be prevented by vaccination, making awareness of its specific characteristics and transmission routes vital in public health.

The other options listed are significant pathogens within the Enterobacteriaceae family but are associated with different illnesses. E. coli is known for causes that range from gastrointestinal infections to more severe conditions like hemolytic-uremic syndrome. Klebsiella pneumoniae is primarily recognized for its role in causing pneumonia and other hospital-acquired infections. Shigella sonnei causes bacillary dysentery but not typhoid fever, which highlights how different members of the Enter