Defying the odds: Determinants of the antimicrobial response of Salmonella Typhi and their interplay

Area of Science:

• Microbiology
• Infectious Diseases
• Genetics

Background:

• Salmonella Typhi causes typhoid fever, with treatment complicated by emerging antibiotic-resistant strains.
• Antibiotic resistance (AMR) in Salmonella arises from genetic mutations or horizontal gene transfer.
• Salmonella can form antibiotic-persistent (AP) cells, further reducing treatment effectiveness.

Purpose of the Study:

• To review the evolution of antibiotic resistance in Salmonella.
• To discuss genotypic and phenotypic mechanisms of Salmonella AMR.
• To explore the links between antibiotic persistence (AP), persistent infection (PI), and AMR.

Main Methods:

• Literature review of Salmonella antibiotic resistance evolution.
• Analysis of genotypic and phenotypic resistance mechanisms.
• Discussion of host and bacterial factors influencing persistent infection.

Main Results:

• Antibiotic resistance in Salmonella is multifaceted, involving genetic changes and phenotypic adaptations like persistence.
• Persistent infections and antibiotic-persistent cells contribute significantly to the development and maintenance of AMR.
• A shift in host immune response (Th1 to Th2) complicates chronic Salmonella Typhi infections.

Conclusions:

• Understanding the interplay between AP, PI, and AMR is crucial for developing new therapeutic strategies against Salmonella Typhi.
• The evolution of resistance mechanisms in Salmonella necessitates ongoing research into novel treatment approaches.
• Addressing chronic carriage and immune evasion by Salmonella is key to combating typhoid fever.