Improving the vaccine efficacy gap with microbial-derived therapies

Area of Science:

• Microbiome research
• Vaccinology
• Immunology

Background:

• Oral polio and rotavirus vaccines show reduced efficacy in low-resource settings.
• This underperformance is associated with specific gut microbiome compositions.
• Current broad-spectrum probiotic approaches have not effectively enhanced mucosal vaccine immunity.

Purpose of the Study:

• To examine the reasons behind the ineffectiveness of empiric probiotics in boosting mucosal vaccine immunity.
• To propose novel, mechanism-driven microbial therapies for enhancing vaccine responses.
• To explore strategies targeting epithelial barriers, immune-modulating metabolites, and viral interference.

Main Methods:

• Review of existing literature on microbiome-vaccine interactions.
• Analysis of factors influencing mucosal immunity in diverse settings.
• Conceptual framework for developing targeted microbial interventions.

Main Results:

• Empiric probiotics and broad taxonomic interventions are largely ineffective.
• Distinct microbiome compositions significantly impact vaccine performance.
• Mechanism-driven approaches offer a promising alternative.

Conclusions:

• Future strategies should focus on targeted microbial therapies.
• Modulating epithelial barriers, metabolites, and viral interference are key mechanisms.
• Personalized or mechanism-based microbiome interventions could improve vaccine efficacy in underperforming populations.