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Smallpox and smallpox vaccination: neurological implications.

John Booss1, Larry E Davis

  • 1Department of Veterans Affairs, V.A. Connecticut Health Care System, West Haven, CT 06516, USA. john.booss@med.va.gov

Neurology
|April 23, 2003
PubMed
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Widespread smallpox vaccination is resuming, but diminished population immunity raises concerns. Serious neurological complications like postvaccinal encephalomyelitis (PVEM) require further study and management strategies.

Area of Science:

  • Public Health
  • Immunology
  • Neurology

Background:

  • Smallpox vaccination was discontinued in the U.S. in 1972, leading to diminished immunity in the general population.
  • The world was declared smallpox-free in 1980, with limited vaccination post-eradication.
  • Resumption of widespread vaccination necessitates understanding and managing potential complications.

Purpose of the Study:

  • To review the current status of smallpox immunity and vaccination strategies.
  • To highlight serious neurological complications associated with smallpox vaccination.
  • To propose strategies for managing and researching these complications.

Main Methods:

  • Review of historical vaccination data and current public health strategies.
  • Analysis of reported cutaneous and neurological complications of smallpox vaccination.

Related Experiment Videos

  • Discussion of neuropathology and potential therapeutic approaches for postvaccinal encephalomyelitis.

    • Main Results:

    • The majority of the global population lacks immunity to smallpox.
    • Cutaneous complications and serious neurological conditions like postvaccinal encephalomyelitis (PVEM) and postvaccinial encephalopathy (PVE) can occur.
    • Mortality rates for PVEM have historically been high (10-50%), with unknown immune targets.

    Conclusions:

    • Comprehensive surveillance and case definitions for neurological complications are crucial.
    • Multi-institutional trials for antiviral and immunomodulatory therapies for PVEM are recommended.
    • Neurologists must be involved in vaccination program planning and complication management.