Select Gut Microbiota Impede Rotavirus Vaccine Efficacy

Area of Science:

• Microbiology
• Immunology
• Vaccinology

Background:

• Rotavirus (RV) vaccine protection varies significantly between individuals.
• The role of gut microbiota in modulating RV vaccine efficacy remains largely unexplored.

Purpose of the Study:

• To investigate the influence of microbiota composition on rotavirus (RV) vaccine efficacy.
• To identify specific microbial taxa that may affect RV vaccine responsiveness.

Main Methods:

• Mice were colonized with segmented filamentous bacteria (SFB) to assess impact on RV vaccine efficacy.
• Fecal microbial transplants (FMTs) from children with varying RV vaccine responses were administered to mice.
• Mice underwent RV vaccination and challenge post-FMT to evaluate immune responses and protection.

Main Results:

• SFB colonization mimicked RV vaccine failure, impairing anti-RV antibody generation.
• FMTs from high-responders conferred robust RV vaccine immunity in mice, while FMTs from non-responders resulted in poor responses.
• Clostridium perfringens was identified as a potential contributor to RV vaccine non-responsiveness, with its abundance linked to vaccine failure in children.

Conclusions:

• Gut microbiota composition significantly influences RV vaccine efficacy.
• Clostridium perfringens is implicated as a key bacterial taxon affecting RV vaccine response, though other microbes may also play a role.