Why some infections target your nerves and how they change the body
In short: Infections do not just attack the lungs or gut; they often target the peripheral nervous system with devastating precision. From the paralysis caused by polio to the sensory damage of leprosy, pathogens have evolved complex ways to disrupt our nerves, either through direct invasion or the release of potent toxins.
The peripheral nervous system is a frequent, if often overlooked, battlefield for infectious diseases. According to Professor Sir Christopher Whitty, certain pathogens have evolved to interact specifically with these nerves as a standard part of their disease progression. These interactions generally fall into two categories: those that primarily affect motor nerves, leading to weakness or paralysis, and those that invade sensory nerves, causing pain or loss of sensation. Polio, a disease currently nearing global eradication, serves as a primary example of a motor-nerve pathogen. Conversely, leprosy and the common herpes zoster virus—which manifests initially as chickenpox—are known for their ability to invade and disrupt sensory pathways.
Beyond direct invasion, some bacteria exert influence from a distance by producing powerful toxins that interfere with nerve function. Tetanus, diphtheria, and botulinum are classic examples of this mechanism, where the bacteria themselves may not need to colonize the nerve tissue to cause systemic neurological damage. Understanding these distinct pathways is essential for developing effective clinical interventions. As Whitty noted in his 2019 Gresham College lecture, the study of these interactions is not merely academic; it is a vital component of public health strategy, especially as the medical community works to refine treatments for these debilitating conditions.
The broader context of infectious disease management is shifting as the population ages. While high vaccine uptake has successfully rendered diseases like diphtheria and measles uncommon in England, recent declines in immunization rates pose a renewed threat. Furthermore, the rise of antimicrobial resistance and the constant evolution of pathogens mean that our countermeasures must also adapt. As highlighted in the 2025 Chief Medical Officer’s annual report, protecting older adults is now a critical priority, as they face higher risks of mortality and long-term health impacts from infections, including increased susceptibility to cardiovascular events. Maintaining a robust infrastructure to identify and respond to these evolving threats remains a cornerstone of modern public health.
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Sources
- Summary by Intellect · source: Infections and the Nerves - Chris Whitty
- Also: Chief Medical Officer’s annual report 2025: infections
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