Typhoid fever: pathogenesis and disease

Area of Science:

• Microbiology and Immunology
• Infectious Diseases
• Pathogenesis Research

Background:

• Typhoid fever is a widespread infectious disease with significant global health implications.
• While Salmonella typhimurium is well-studied, data on Salmonella typhi (S. typhi) and typhoid fever pathogenesis remains limited.
• Existing research often focuses on mouse models or in vitro human cell line interactions, necessitating a specific review on S. typhi.

Purpose of the Study:

• To review the pathogenesis of typhoid fever caused by Salmonella typhi (S. typhi).
• To focus on key aspects: adherence and invasion of gut epithelial cells, dissemination to systemic sites, and intracellular survival and replication.
• To contextualize current Salmonella research within the specific framework of typhoid fever.

Main Methods:

• Literature review synthesizing existing research on Salmonella typhi.
• Analysis of studies focusing on bacterial adherence and invasion mechanisms.
• Examination of research detailing bacterial dissemination and intracellular survival strategies.

Main Results:

• S. typhi adheres to and invades intestinal epithelial cells, initiating infection.
• The pathogen disseminates from the gut to systemic sites.
• S. typhi possesses mechanisms for survival and replication within host cells, contributing to disease persistence.

Conclusions:

• Understanding S. typhi's adherence, invasion, dissemination, and intracellular survival is crucial for comprehending typhoid fever pathogenesis.
• Further research is needed to bridge the gap between general Salmonella knowledge and S. typhi-specific mechanisms.
• This review provides a focused perspective on S. typhi research in the context of typhoid fever.