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Related Experiment Videos

Can postexposure vaccination against smallpox succeed?

Philip P Mortimer1

  • 1Virus Reference Division, Central Public Health Laboratory, London, United Kingdom. pmortimer@phls.org.uk

Clinical Infectious Diseases : an Official Publication of the Infectious Diseases Society of America
|February 21, 2003
PubMed
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Post-exposure smallpox vaccination, even when delayed, can prevent or attenuate disease. Prompt vaccination of contacts is crucial for bioterrorism preparedness.

Area of Science:

  • Public Health
  • Infectious Disease Epidemiology
  • Vaccinology

Background:

  • Smallpox virus poses a bioterrorism threat.
  • Limited immunity in the current population due to waning vaccine effectiveness and lack of widespread primary vaccination since the 1970s.

Purpose of the Study:

  • To evaluate the effectiveness of post-exposure smallpox vaccination.
  • To inform modern contingency planning for bioterrorist smallpox release.

Main Methods:

  • Review of historical data on post-exposure vaccination outcomes.
  • Analysis of vaccination timing relative to disease onset and severity.

Main Results:

  • Prompt vaccination of smallpox virus contacts often prevented disease entirely.

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  • Revaccination within the first week of incubation was highly protective.
  • Revaccination in the second week attenuated disease and reduced mortality.
  • Primary vaccination within 4 days of exposure was generally protective against severe illness.

    • Conclusions:

    • Modern bioterrorism preparedness must include rapid contact tracing and vaccination capabilities.
    • Anticipatory vaccination strategies should be considered for populations with low immunity, especially in potential target countries, due to the risk of delayed vaccination reach.