Which pathogen is primarily responsible for enteric fevers like typhoid fever?

Which pathogen is primarily responsible for enteric fevers like typhoid fever?

• A. Escherichia coli
• B. Salmonella typhi
• C. Shigella dysenteriae
• D. Listeria monocytogenes

Answer: (B)

The pathogen primarily responsible for enteric fevers, such as typhoid fever, is Salmonella typhi. This bacterium is a specific serotype of the Salmonella genus, which causes systemic illness characterized by prolonged fever, abdominal pain, and gastrointestinal symptoms. Unlike some other species of Salmonella, which may cause gastroenteritis, Salmonella typhi is uniquely adapted to invade the intestinal mucosa and disseminate throughout the body, leading to systemic infection and the clinical presentation of typhoid fever. The disease typically spreads via contaminated food and water, emphasizing the importance of sanitation and hygiene in preventing infection. In contrast, while other pathogens listed can cause gastrointestinal illnesses, they do not typically present as enteric fever. For instance, Escherichia coli is known for causing a variety of infections, mostly associated with gastroenteritis, Shigella dysenteriae leads to bacillary dysentery, and Listeria monocytogenes is associated with listeriosis, particularly in immunocompromised individuals and pregnant women. These distinctions underscore the specificity of Salmonella typhi in relation to typhoid fever.

The pathogen primarily responsible for enteric fevers, such as typhoid fever, is Salmonella typhi. This bacterium is a specific serotype of the Salmonella genus, which causes systemic illness characterized by prolonged fever, abdominal pain, and gastrointestinal symptoms. Unlike some other species of Salmonella, which may cause gastroenteritis, Salmonella typhi is uniquely adapted to invade the intestinal mucosa and disseminate throughout the body, leading to systemic infection and the clinical presentation of typhoid fever.

The disease typically spreads via contaminated food and water, emphasizing the importance of sanitation and hygiene in preventing infection. In contrast, while other pathogens listed can cause gastrointestinal illnesses, they do not typically present as enteric fever. For instance, Escherichia coli is known for causing a variety of infections, mostly associated with gastroenteritis, Shigella dysenteriae leads to bacillary dysentery, and Listeria monocytogenes is associated with listeriosis, particularly in immunocompromised individuals and pregnant women. These distinctions underscore the specificity of Salmonella typhi in relation to typhoid fever.