Diagnostics for invasive Salmonella infections: Current challenges and future directions

Area of Science:

• Infectious Diseases
• Diagnostic Development
• Antimicrobial Resistance

Background:

• Invasive Salmonellosis, caused by Salmonella Typhi/Paratyphi or non-typhoidal serotypes, lacks accurate rapid diagnostic tests.
• Current methods like blood culture are slow and insensitive; molecular and serologic tests have limited accuracy.
• In resource-limited settings, reliance on clinical diagnosis or inaccurate tests fuels unnecessary antibiotic use and resistance.

Purpose of the Study:

• To highlight the urgent need for improved diagnostic tools for invasive Salmonellosis.
• To discuss the challenges and opportunities in developing and implementing new diagnostic assays.
• To emphasize the importance of integrating diagnostics for Salmonellosis with those for other febrile illnesses.

Main Methods:

• Review of current diagnostic limitations for invasive Salmonellosis.
• Discussion of emerging diagnostic technologies (serologic, molecular, transcriptomic, metabolomic).
• Analysis of barriers to diagnostic assay adoption, including empiric therapy practices.

Main Results:

• Existing diagnostics for invasive Salmonellosis are inadequate in sensitivity, speed, and resource requirements.
• Novel approaches are under development, but face challenges in uptake.
• Empiric antibiotic therapy presents a barrier to diagnostic test utilization.

Conclusions:

• Development of accurate, rapid, and affordable diagnostics for invasive Salmonellosis is critical.
• New diagnostics must be deployed alongside tests for alternative febrile illnesses to ensure appropriate antibiotic use.
• Incentive-based strategies may be necessary to promote diagnostic development and adoption in resource-limited settings.