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Facial palsy and infection: the unfolding story
1Department of Microbiology, Aberdeen Royal Infirmary, Scotland.
Abstract:
While it is now universally accepted that Ramsay Hunt syndrome is caused by varicella-zoster virus, Bell's palsy continues to be labeled "idiopathic." We review the literature associating Bell's palsy with various infectious agents as well as with Kawasaki disease, a condition in which an infectious etiology is suspected. Good evidence--mostly serological--exists for an etiologic role for the herpes group of viruses, mumps virus, and rubella virus. In addition, recent evidence has focused on Bell's palsy in human immunodeficiency virus infection and Lyme borreliosis. In view of the multiplicity of implicated agents, it is likely that the immunologic response associated with infection triggers a cranial or generalized polyneuropathy culminating in facial nerve compression, degeneration, and paralysis. The mounting interest in Bell's palsy, coupled with the increasing availability of more sensitive and specific tests, is likely to augment the available evidence for an infectious etiology and to clarify the role of other, previously unsuspected infectious agents.
Insights
Bell's palsy, unlike Ramsay Hunt syndrome, is often considered idiopathic. However, evidence suggests infections from viruses like herpes, mumps, and rubella, as well as HIV and Lyme disease, may trigger facial paralysis.
Area of Science:
- Neurology
- Infectious Diseases
- Immunology
Background:
- Bell's palsy is frequently classified as "idiopathic" despite established viral causes for similar conditions like Ramsay Hunt syndrome.
- An infectious etiology is suspected in Kawasaki disease, prompting investigation into similar triggers for Bell's palsy.
Purpose of the Study:
- To review the existing literature linking Bell's palsy to various infectious agents.
- To explore the potential role of specific viruses and bacteria in the development of Bell's palsy.
- To understand the immunologic mechanisms underlying infection-induced facial nerve paralysis.
Main Methods:
- Literature review of studies associating Bell's palsy with infectious agents.
- Analysis of serological evidence implicating specific viruses.
- Examination of recent research on Bell's palsy in the context of HIV infection and Lyme borreliosis.
Main Results:
- Strong serological evidence supports the role of herpes viruses, mumps virus, and rubella virus in Bell's palsy.
- Emerging evidence links Bell's palsy to human immunodeficiency virus infection and Lyme borreliosis.
- The immunologic response to infection is proposed as a mechanism for facial nerve neuropathy.
Conclusions:
- Bell's palsy likely results from an immunologic response to various infectious agents, leading to facial nerve damage.
- Increased research and improved diagnostic tests are expected to further elucidate the infectious causes of Bell's palsy.