Beyond the Gut: The Surprising Science of Respiratory Microbes with Dr. Michael Cox

While the gut microbiome often steals the spotlight, the microorganisms residing in our respiratory tract play a vital role in our health and immunity. In this episode, Dr. Sheena Fraser sits down with microbial ecologist Dr. Michael Cox to explore the fascinating, complex, and relatively uncharted territory of the lung microbiome.

They discuss how the lung microbiome fundamentally differs from the gut, the daily flux of bacteria entering and leaving our airways, and the profound impacts of environmental factors like air pollution, smoking, vaping, and household cleaning products. Plus, Dr. Cox shares the massive challenges scientists face when studying these deep-tissue microbes and what the future of respiratory medicine might look like.

What We Cover:

• From Seawater to Sputum: Using marine ecology techniques to decode human respiratory biology.
• Exploring the lungs' dynamic balance of microaspiration and mucociliary clearance.
• Meet the core lung bacteria (Streptococcus, Prevotella, Veillonella) and the puzzle of anaerobes in an oxygen-rich space.
• Environmental Disruptors: How pollution, smoking, and vaping inflame and alter the lung microbiome.
• Hidden Dangers of VOCs: The silent impact of everyday cleaning sprays and aerosols on respiratory health.
• Diet, Exercise, & Epigenetics: The systemic benefits of a high-fiber diet and fitness for chronic lung conditions like COPD and asthma.

About

Dr. Michael Cox is a microbial ecologist and the PGR Lead for the Institute of Microbiology and Infection at the University of Birmingham. His research focuses on the bacteria that reside in the respiratory tract in the context of respiratory diseases (such as COPD and Cystic Fibrosis). His lab works to understand the function of the respiratory microbiome, translate these findings for clinical benefit, and expand our understanding of the respiratory ecosystem beyond just bacteria.

Connect with Dr Michael Cox:

• University of Birmingham

Scientific References & Further Reading:

• Cumming, K. J. (2018). "Long term effects of cleaning on the lungs." American Journal of Respiratory and Critical Care Medicine, 197(9):1099-1101.
• Hussain, S., et al. (2024). "Unlocking the secrets: VOCs and their devastating effects on lung cancer." Pathology - Research and Practice, 255:155157.
• Welsh, H. A., et al. (2026). "The effect of vaping on the human lung microbiota." Inhalation Toxicology, Vol 38, Iss 1.

This podcast is brought to you in collaboration with the British Society of Lifestyle Medicine.

Disclaimer:

The content in this podcast is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your doctor or qualified healthcare provider. Never disregard professional medical advice or delay in seeking it because of something you have heard on this podcast.