Gut microbiome and viral infections: A hidden nexus for immune protection

The gut microbiome plays a crucial role in regulating immune responses, influencing susceptibility to viral infections, shaping disease progression, and its outcomes. Emerging research highlights the intricate relationship between gut microbial communities and viral pathogenesis, demonstrating that dysbiosis can compromise antiviral defenses while a balanced microbiome enhances immune resilience. This review explores key microbial mechanisms, including microbiome-mediated immune modulation, interactions with viral replication, and the impact of microbiome on systemic inflammation, highlighting how dietary interventions, such as probiotics, prebiotics, and bioactive compounds, offer potential strategies to modulate gut microbiota and mitigate viral infections. Special emphasis is placed on viruses affecting the gastrointestinal and respiratory systems, including severe acute respiratory syndrome coronavirus 2, norovirus, and influenza. Furthermore, we explore how nutrition-driven microbiome interventions may serve as adjunct therapeutic strategies, improving vaccine efficacy and post-viral recovery. Understanding the role of gut microbiome in viral infections can pave the way for microbiome-driven strategies to combat viral diseases and improve overall health outcomes.